Tue Jul 30, 2019 8:22 pm by MHM
^^This.
@John - the relocker is there to combat an old (like 100 years ago) attack whereby the yegg would grind or hammer off the dial, then get a punch and hammer the spindle, cam, and sometimes wheelpack out into the guts of the safe. This would either bork the lock to the point where he could simply now open the boltwork, or if the lock was a bit more complex, poke a wire through the hole into the now empty guts of the lock body and retract the bolt.
The countermeasure was for the lock manufacturer to turn the attack on itself. If you have a look at the inside of the lock cover you'll see a line of thinner metal in the casting, which I'm pointing to in the photo below. The cover holds that relocking arm down when it's assembled and working correctly but is designed to snap away if someone punches the lock, spewing the now snapped back plus the workings of the lock out into the safe but also triggering the relocking arm to come down and engage the bolt in the locked position. At that point it doesn't matter what you do...that bolt is staying locked.
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