Originally Posted by
Kevin Brown
I place the disc onto the plate, trace the diameter onto the backing plate. I use masking tape to wrap the threads of the backing plate stud, then clamp it into a handheld drill. Put my safety glasses on, set the drill on a solid surface (like a table) to stabilize, spin the plate at a moderately slow speed, and push an X-Acto blade through the marked line. I`ve gotten to the point now of just measuring and marking the backside of the pate, as it is easier to get a straight cut pushing through the foam versus pushing through the Velcro® first.
Then, I use 80 a file to shaped the plate if it needs to be trimmed a lot. Otherwise, I use an 80-grit sanding disc to shape, and then finish off with 180-grit. To sand, just spin the plate using the drill, and sand using the other hand.
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