Neat idea Dan. What size hole? How will you sand the inside?
Inch and a half hole. 2" ish od.
The insides off the Forstner aren't actually too bad.
I'm looking for a good used spindle sander.
Right now I put one of the sanding drums (these kits are very reasonably priced) in my drill press.
Same idea and the benefits I miss from the oscillation aren't really vital on the inside of these.