not if you extend the sanding drum above the screw - that's what I did - but you do need to be ginger with it - like i said. That said if I had a pipe reamer that's what I would have used but it worked for me. The bottom dead center on mine was not caked howeverDremel really will screw up the bottom of a bowl with that mounting screw. A reaming tool or fine sandpaper is really the only way to go for the bottom of the bowl which is where the OP says his problem is located.
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