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Peterson
MiniKnife Instructions
The Peterson MiniKnife
promotes finer steel than what is currently on the market. The steel will
allow more techniques to be applied to your projects without folding the
blade. You will be able to feel what is happening inside of the lock better
and to manipulate the blade to the location needed to create a clean and
fast opening procedure. The Peterson MiniKnife will open wheeled combination
padlocks like the PrestoÒ series, the Corbin, the Sesamee, and
the MasterÒ. You can also open GM Combination Glove Box Locks as
well as other direct drive luggage combination locks.
MasterÒ and Sesamee: Both of these locks are of similar construction.
They both have a locking plate with fingers and they both have combination
wheels with collars that discourage entry of a tool such as the MiniKnife.
Opening the MasterÒ and Sesamee: These two padlocks can be opened
by the same process. You want to insert the Peterson MiniKnife not quite
halfway into the MasterÒ #175 beside either side of wheel number
three. Go into the lock above the centerline and feel your way underneath
the locking plate. Remember that there is a collar on the wheels that
will discourage entry. You can slightly bend the tip of the MiniKnife
with your fingertips if needed. With the Sesamee lock, you will want to
insert the blade beside the second wheel and go nearly all of the way
in with the blade. You are trying to get under the locking plate to move
the locking plate towards the side of the lock body. Pushing in on the
shackle will help you to maneuver under the plate. By exploiting the locking
plate at its weakest point, where the spring in the lock is trying to
push the locking plate towards the center of the lock, you will be lifting
this plate while at the same time pushing in on the shackle. You will
then release the shackle while maintaining the tension against the locking
plate.
Opening the Presto 2620: Instead of lifting the MiniKnife’s tip
as you did above with the Master and Sesamee, you will be pushing on the
blade to open the 2620. Curve the tip of the blade so that as contact
is made with the locking plate, the blade tip will be half way between
tumbler two and three. You will bend the tip and insert the tip of the
blade so that it is pointing left as you enter the left side of the third
tumbler wheel. Feel the spring pressure of the locking plate and continue
to push in while pushing in and releasing the shackle. The shackle action
will be the same as on the Master and Sesamee.
Opening the Presto 2470 and other direct drive combination locks: Direct
drive means that the combination must be known for the tumblers to release
the shackle or locking bolt. There is not a bypass (locking plate and
locking plate tab or bar is not present) as in the other locks mentioned
above. To accomplish the opening you will place the end of the MiniKnife
to the left side each of the combination wheels. You will then rotate
each wheel in turn finding the indention on the spindle beside each wheel.
The indention on each wheel is the opening indicator. You will line the
indentions as if you were dialing the combination to the opening index
(that is between the arrows on the side of the padlock). With the indentions
between the arrows, subtract two numbers from each wheel. This should
be the opening combination. If the padlock does not open when the shackle
is pulled, continue to rotate all of the combination wheels subtracting
one more number from each wheel until a full rotation has been completed
testing for shackle opening with each new setting. If the effort still
fails, then an error in finding the indentations may have occurred and
you will need to try the procedure again. Reference the photos for a better
understanding.
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Shaping
the MiniKnife’s Blade
A flat blade will work with a wiggling effort as you insert the
blade into the Master and the Sesamee padlocks. It is also best
left straight when trying to decide the code for the Presto 2470.
On the Presto 2620, you will need a bend on the tip to push on the
locking plate. It really makes little difference whether the angle
on the blade tip is up or down. It is entirely a user preference.
The blade above that is on top is one that has been broken a few
times in our trial testing and yet, it is still very useful in opening
all of the padlocks. It may be even better on the Presto 2620 since
the pressure is pushing instead of lifting. |
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The
Sesamee 400 Series
The Sesamee will
open much like the Master. There is no angle going into lock body.
You will also insert ¾ of the MiniKnife’s blade. The
insertion will take some maneuvering up and down of the as you try
to get comfortably under the locking plate. Once under the plate
and ¾ of the blade is into the body and you can feel the
spring tension against the blade of the MiniKnife as you press downward,
then proceed to press in on the shackle as you press down on the
MiniKnife with your thumb and forefinger supporting the MiniKnife’s
blade |
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Master
175 Opening
Insert the Peterson
MiniKnife into the third tumbler wheel. It can be inserted to the
left of right of the wheel. Upon insertion, the MiniKnife will need
to be pushed past a collar on the tumbler wheel as it enters. Push
past the collar and into the heart of the lock. Half of the MiniKnife
will be inserted. Now, while pressing inward on the padlock’s
shackle and releasing as you place downward pressure on the MiniKnife
supporting the blade with your thumb and forefinger. You must place
inward pressure on the shackle to release the pressure that is on
shackle’s locking bolts and then release to trigger an opening
once the locking plate tab has been moved. |
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Presto
2470 Opening
The Presto 2470
does not have a locking plate to work with. Instead, it is a direct
linkage, which means that you will need to find out the combination
in order to open the lock. Place the MiniKnife to the left side
of each tumbler in turn. Find the grove indention that is on each
of the tumbler bearings. You will be finding the indention along
the arrows on the side of the lock. With indentions lining up between
the arrows, subtract two numbers from each wheel and the lock should
open by pulling on the lock’s shackle. If you missed the set
up then you can try to subtract another number or try running the
exercise again. |
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Presto
2620 Opening Entry
First, you want
to bend the tip of the MiniKnife. You will be hunting for a spring
tension on the locking plate that is located midway between tumbler
wheels two and three. Insert the MiniKnife to the left of tumbler
number three above the center spindle and at an angle to match that
shown in the above photo. Once you feel the spring tension, continue
to push in while pressing in on the shackle. When you press in on
the shackle remember to also release it quickly. This is the same
procedure that is done with the Master and Sesamee when we activate
the shackle action. |
Additional
Training and Photographs.
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Master
175 – Seeing the Works
1) This points to the locking plate tab that is placed between the
locking shackle bolts. When this tab is moved by the MiniKnife towards
us in this photo (or the padlock’s outer casing), the locking
bolts holding the shackle are freed to release the shackle.
2) This points to the over all locking plate and the spring that
pushes against the outer padlock casing, keeping the locking plate
tab in place and will assist in pushing the locking plate fingers
towards the tumbler once the flats on the tumblers are aligned.
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Presto
2620 Seeing the Works
This is really a jumbled mess. It is difficult to get this one apart
and still have the shackle hold still for a photo. The arrows point
to the locking plate bar tab that holds the shackle in the locked
position. As you push in on the locking plate (from the other side
of this shot), you will be moving the locking plate bar tab out
of the cavities in each side of the shackle. |
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Presto
2470 Spindle Indentions
The indentions are found to the left of each tumbler wheel. Each
wheel surrounds and guides a splined turret. The arrows on the right
point to the three splined turrets that rotate with each of the
combination wheels. The arrow on the left points to the indention
that is on each of the splined turrets. Only the one indention is
being shown (the one closest to the shackle that is moved by the
first wheel). Lining up all three indentions will then allow an
opening once two numbers have been subtracted (that is if you have
lined up the indentions along the opening index indicated by the
arrows on the lock body).
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Sesamee
Locking Bolts
While this is of the Sesamee 400 series, the locking bolts are pretty
much the same on the Sesamee and the Master 175. The arrow points
to the space that is occupied by the locking plate tab when the
workings are in place. On the bottom of this space, where you see
the notch, is where the tab will move to when the opening occurs.
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