The ring that I cut last night needed a little cleanup on the lathe. I cut a 1.6" OD ring from a 1.55" wide pieces so when it reached the few thousandths of depth it ceased to hold solidly and produced a less than perfect bottom. The lathe cleaned the outer edge nicely and I bored about 03" from the interior to get a loose fit on the extension tube.
The CFC supplier recommended 3M ScotchWeld for gluing CFC. The ring and tube are sitting on a Release Agent wet piece of paper so it does not stick. I understand this might take a couple hours to complete curing. At that point I will tap a 1/4"-20 hole for holding the eyepiece.
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