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Lock-Picking: Mushroom and Spool Pin Tumbler Locks
MUSHROOM AND SPOOL PIN TUMBLER LOCKS
High-security pin tumbler locks may contain specially
made pins to make picking them more challenging. The
pins are machined so as to make picking them quite dif-
ficult. When picking these locks, the pins give the impres-
sion that they have broken, when in fact they could be
a long way from breaking. You can tell whether or not
you are picking a pin tumbler lock that has these pins by
the fact that the pins seem to align so easily with a louder
than normal click. The cylinder seems eager to open but
to no avail.
The picking procedure relies on a well-yielding tension
wrench. The tension wrench has to be lightly spring-loaded
so that the pins can bypass their false breaking points.
You also have to "rake" (seesaw in and out) the pins with
your pick. The feather-touch tension wrench is ideal for
the job. Use light pressure with it, and it will let you in.
(Note: A feather-touch tension wrench is not necessarily required. A normal
tension wrench will work fine with an extremely light tension on it. The
weight of just your index finger alone should be enough in most cases.)
The mushroom and spool pins are used in locks for
high-security purposes such as bank doors. The American
Lock Company uses them in some of their padlocks.
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