I also pulled out my hi tech table sander, also known as an upside down belt sander and did the main sanding on the grips.
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Got a little done today, i was able to drill and tap all the holes and get the real screws in it.
If you dont mind me asking, how did the polystone react to tapping?
That is the plan. It will have a spring loaded trigger for sure and hopefully a hammer that can be pulled back and springs forward when the trigger is pulled.