Dennis hit it right much better ones available. I have one from the sanding glove and one from woodturning wonders and am happy with both.
We have had several of these over the years for our mentoring program at West High School, they do not last with lots of use. The last unit we bought was from the sanding glove and they have a seal bearing. I use the sanding solution unit as well as others in the club.
http://www.thesandingglove.com/The-Sanding-Solution.asp
Just wondering if anyone has experience with the Sorby sandmaster they would like to share. Is it worth using?
Thx.