William Optics 2 inch Rotolock M63 for Gran Turismo 71The William Optics 2 inch Rotolock M63 for Gran Turismo 71 has a female M63 thread that attaches to the back of the William optics GT71 refractor. This visual back can also attach to other branded focusers that use the M63 threading. Meade, 2.5" Feather Touch, Stellarvue, Orion are just a few brands that use this thread.
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