[BmRings[/B]
Lacking a plunge router and the accessory with which one can make custom rings the easy way, I have to make do with tools on hand. For bulk plates and the outside of centering rings, I cut out the rough shape (slightly large) as carefully as possible with a jigsaw, then put on a spindle and turn by hand on a disc sander to get a perfect circle. There is a little trial and error to get a good fit, taking off a tiny bit at a time to avoid the worst case scenario - taking too much off.
For the inside hole in centering rings, the process is similar. Cut out the rough hole (slightly small) as carefully as possible with a jigsaw, then put on a different sort of spindle (one that holds the outside edges) and turn by hand against a sanding drum to get a perfect circle on the inside. Once again, it takes a little trial and error to get a good fit.
Finally, the rings are finished and I can begin final assembly of the interstage coupler.
P.S. Yesterday was our 13th anniversary, and my wonderful and supportive spouse surprised me with an M1300! Wow, so much for the traditional list... (paper, linen, crystal, china, etc.). Thank you, honey!