I purchased this from a member with a view to fitting it to my C8 visual back (would need an adapter). However the C8's focuser (primary mirror adjust) works smoothly and with very little backlash or mirror flop so it hasn't proved necessary.
It's a beautiful piece of kit. Brass compression ring. Smooth movement. Three centimetres travel.
It should retrofit onto certain Stellarvue Finders. Check with Stellarvue first.
Or you may have your own plan for introducing a 2" helical focuser to some equipment.
$35 plus postage.
PM me, please
