I do not use a sharp pointed object to scribe the DHBP/Recoil pad when fitting a pad. The reason being that it's possible to chip the finish as you scribe the line. Instead, take blue painters tape and tape around the entire edge of the DHBP so that half is stuck to the plate and half is off the edge. Mount the DHBP/Recoil pad and scribe your line with a sharp pencil or black pen. It will show up nicely on the blue tape. Take the DHBP off and trim excess tape off with a sicssors. As your sanding, the sander will sand off the tape along with the plate. When you just see the scribed mark almost disappear, finish up with fine grit paper as Bob mentioned.
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