Hi Greg, That's a very useful sanding set-up. It's less elegant, but
you might want to skip the face plate and thread the disc itself since
you'll need to face it anyway. Adjust the register extension with
washers or a turned filler. A tap made from a bolt slightly undersized
for your spindle with cutting-threads made by filing three length-wise
sharp edged grooves might suffice for threading wood discs to fit your
lathe. Some suggest strengthening the disc's threads with superglue, but
I just moisten them with a little water before use and they stay tight.
Of course, cleaning the spindle after each use is a must. Or better
yet... just do it your way, which you know works for you!
Merry Holidays and Happy Christmas.
Turn to Safety, Arch
Fortiter
http://community.webtv.net/almcc/MacsMusings