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Hi Ken & All
Thought I'd chime in with my experience with locating the "O" rings. From my measurements with verniers, they are 54mm od x 50mm id , therefore 2mm thick and I bought a packet of 10 for $4.65 from an Ebay store ( Chinese ) called solaluna88. My GSO and Skywatcher finders measure 53mm od and the groove the ring locates in is .5 deep, so 1mm off the dia. The rings have to stretch a little to fit over the finder body but that just makes them a nice and snug fit in the groove.
I still have some left, so if you would like one PM me your address and I'll put it in the mail.
Sorry folks the offer isn't open to everyone who might like one as the supply is limited and I want to keep a few spare for myself.
Cheers
Jeff.
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