Hi Joe
Here are some snapshots of the Drum Sander plus a snapshot of the Jasper cir.jig my son drill out the center hole so I put in a plastic plug in with a 3/4" I.D. to use the brass guide, that just drops in the jig, with the plastic insert in place no need to bolt the jig to the router now , it can also be used on the router table by using the brass guide system and no fence needed.
Just a note *** by using a bigger brass guide and a vac. pickup on the router the chips will be pulled out the bottom that should help cutting cir. on the router table.
Bj