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The rear safety plate I made from a piece of 1/8" bar stock. The front spring plate is fixed and the slotted safety bar slides from side to side behind it allowing the trigger stop to move into position over the trigger linkage and blocking its upward movement. The screws thread into tapped holes drilled horizontally through the top mounting bracket, into the backplate (not through the backplate).
   At left is a large spring clip I used to make the safety spring. I heated it red hot, then cut out the back section where there are no markings. I roughed out the spring, cutting it to width, but not length, as it will shorten somewhat when the groove is added. The metal will not need to be retempered - there should be plenty of spring left in it.

Figure B

Figure A
As shown in figure "A", I made a form to press the groove in the spring plate. Best to press in a vise and not use a hammer to drive the drill shank into the spring as it will compress the metal at that point and it will break. Once you have the groove in the spring plate you can shape it to spec.

Safety shown installed on backplate
DRAWINGS

The slide I made from a section of 1/2" angle.

The 1/8" grooves are drilled by employing the same method used to make the spring plate form grooves.
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