Hold the block up against the siding s lower or butt edge and using.
Cutting a square hole in log siding.
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The block as a guide mark the vertical cuts in the siding with a utility knife.
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Between each cut adjust the blade depth so it is deeper by inch.
Set the block aside and use the knife to carefully cut away the siding along the top and the marked sides.
Cut the square place the drill with the point of the bit at one inside corner of the square.
Hold the siding firmly while you cut it and close the jaws of the snipper only about 2 3 of the way on each cut.
The edges of the drill bit should touch the sides of the square but not go past it.
Set the depth of the blade to about inch and cut the lap siding in small increments.
A rotary tool is the best tool for cutting siding that is already hanging.