Is this backing plate reusable? How difficult would it be to remove the lap disk so I could reuse it?

Yes, the aluminum backing plate is reusable, just need few minutes to change grits when combine metal lap disks to use.

can this be used as a replacement disc for an old craftsman 6" belt and disc sander?

This aluminum disc is 6" dia x 1/2" Arbor x 9/32" thickness, as long as the size fit for your machine, it's work.

What do you use to attach sanding disc to this?

I use this on a faceting machine. It sits horizontal and thin diamond topper laps sit on top of it. They are both held down then by a nut that screws down onto the top.

EMILYPRO Aluminum Disc Master Base Lap Dia x Thickness: 8" x 9/32". Arbor Hole: 1/2". Plate Grinding Pads for Flat Abrasive Wheels/Backer-Disc/Slant Cabber Polishing Machine - 1 Pack

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