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rocarule, thanks for the tips, I hope they will help the OP with their project.

I do have the knowledge how to thin scale material without power tools (check my gallery for how they turn out), but I was hoping you would share some tips for the OP on how to if you would not mind.

It is easy for those that have power tools I agree, for those that have no sander or planar thinning is not as trivial.

Can you share some tips?

3/16 sounds pretty thick for scales. The thickness of the wedge depends on the razor grind mainly, and notice it is a wedge not a spacer so one end will be thinner than the other.

I am not sure...