The selector plate works by pushing the cut-off lever back out of position when the selector is rotated.
If you cut/trim out the notch on the selector plate, so that it doesn't touch the cut off lever when in the full auto position...it won't push the lever back, which will result in semi-only, regardless of selector lever position.
It's obviously a one-way change. Once done, the only way to undo-it is to replace the selector plate.
It can be done with a sharp knife (i.e. xacto) and you don't need to disassemble the mechbox to do it.
Good luck,
Tys
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