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You can use a small metal 'rat tail' rasp or simply wrap and glue a spiral strip of sand paper around a wood dowel or steel rod.

I like to clamp the reamer in a fixed horizontal position and move...

Gentle heat will break the bond of most adhesives. Allow plenty of time for the heat to penetrate. It might take over 45 minutes for the heat to migrate into the center. A heat gun with variable...