[Eldest_Sibling (Alan)]

Isn't it lovely?





Success; the next thing to do is to line the inner rim of the cap with flocking, and perhaps with aluminum tape as a substrate, depending. There were ridges round the inner rim of the cap, and were obliterated. I never did like plastic ridges taking up slack, in this instance, or as bearings in the case of draw-tube runs within focusser housings...