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I made a tool from silver steel ,hardened and tempered it. Soak thread with
Kroil then place tool in chuck of a drill press ,hold bolt with soft jaws in a vice,
then with a steady downward pressure of the drill press use Tee handle of tool to screw out the striker/firing pin
The no 1 mk 3 have a 30tpi and the no4 mk 1/2 have 26 tpi BSF
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I just received my tool in the mail. At first, it wouldn't budge. Threw a little Hoppe's No. 9 lubricating oil down the pin, and worked it back and forth for about 20 minutes. Came right out for me, minimal effort.