William Optics 2 inch Rotolock M54 for Zenithstar 61
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Forget about those compression rings and try out the solid beauty of the M63 rotolock system. This William Optics' rotolock for telescopes with an M63 thread, such as the GT71, GT81, Z73, and Z103, is a great way to attach accessories to the focuser of your telescope. All you have to do is rotate clockwise to tighten and center a 2" accessory and rotate counter-clockwise to release.