I think you can get buffing wheels for them so they're not limited to metal work alone.
But you would want to set up some serious housing and get a variety of wheel types and buffing compounds so it would be a major side branch to your creative talents.
Nice to have if just for the mandrel end shaping alone though.
I have some grinding stones that I fit in the chuck of my cordless drill for mandrel ends though.
Much less expensive and takes up a fraction of the space.
I had picked them up to sharpen lawn mower blades in place, so classic double duty tools.
Don't forget the safety glasses in either case.
You don't want to know how I know this.
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