The remaining part of the safety action is the guard pin shown at N Figs. 61 and 62, which is placed in the lever.
As a rule, all the guard pin needs is to be free and not touch the roller.
See that jewel pin reaches fork properly and that the guard pin also reaches the roller.
Several letters were delicately cut on its golden stem, and a guard pin showed how much its wearer valued it.
Be sure the guard pin does not interfere with the fork action in any way.
As to the size of the guard pin, it is usual to make it about one-third or half the diameter of the jewel pin.
When the lock, drop and draw are correct it is next necessary to see that the fork length and guard pin freedom are correct.
When drawing a fork and roller action it is safe to show the guard pin as if in actual contact with the roller.
One of the first results which would display itself would be discovered by the guard pin failing to perform its proper functions.
In reply we would offer the supposition that some workman had bent the guard pin forward or set a pallet stone too far out.