Fri Sep 06, 2013 5:16 pm by Altashot
Based on echoplot's first link...
...Ahem! -The left leg on the drop/fence lever it to assist in throwing the bolt. Whether it be a strait or roller bolt, If the safe's boltwork was not fully extended to the Locked position, upon spining the dial to Lock, the bolt would butt against another part of the boltwork.
If the bolt was only "nose" driven, a condition could occur. If the safe was forcefully closed, or as I like to call it, "disrespected", The drop/fence lever would be forced upwards towards the bump in the casing where the cover "line-up pin" is located...Follow me? this condition could led to the drop lever to get pinched between the drive cam and that said bump. It becomes "nose wedged". In this state, it can be very hard to retract the bolt and/or the boltwork, especially if the door was closed at the same time as the boltwork was thrown AND the dial was spun... It seem far fetched, but it happened. the boltwork would become wedged in the frame and it would put great force against the bolt that would drive the lever to a "nose wedge." this would result to a seized dial. Forcing it could result in a broken spline or even a sheared spindle.
The left leg is there to force the bolt out without forcing the nose up into the bump, therefore it does not disturb the fence's location and it's relation with the gates. If a condition like the one I described above was to occur, the pressure against the bolt would push that left leg into the drive cam and would force it to turn, re-seating the fence within the gates without disturbing the harmony...-
I hope this made sence...
the 4 contact point can be confusing, but a seasoned "cracker" knows how to exploit them as well...
M.