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Welcome to the club.? Not quite the full package Losmandy G11 mount close enough.??

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The best couplers to use here are a constant velocity type coupler that is designed to be used with some axial and angular misalignment.? Read up on the different types and you'll find that the best couplers where you may have some of both a double disc coupler is superior.? They take up some room and cost more but they are the best type for this job.? Where there is no angular misalignment just axial the Oldham's are also the top choice.??

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All other miniature couplers have issues that can be an issue if precision constant velocity power transmission is required.? Do some research and you'll see this is true.??

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To improve your classic 2-piece Losmandy worm drive backlash situation the best and simplist things to do are to hone the closed worm bearing block to allow the outer bearing to float in the block.? That's to say the bearing is allowed to move in and out slightly.? Fit a single R4 size Belleville spring disc inside the greased bearing carrier pointy end facing away from the bearing so the base of the spring disc pushes on the outer bearing shell.? Load a new worm bearing in the bearing carrier push it in and verify the besring moves back out.?

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The other tip is to tie the bearing blocks together in perfect bearing alignment with each other using the worm dust cover to hold the worm bearing blocks in place.? Essentially this gives you a one-piece worm block which allows you to effectively set backlash and keep the worm bearings aligned without having to struggle with dumb luck to get enough pressure on the bearing blocks while trying to set backlash.?

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The two bits above work together to solve one of the two biggest issues with worm drives.?

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If you are talking about the small undersized clutch spacer rings those are somewhat proof your G11 is an older production mount.? Older mounts seem to have come with these smaller diameter clutch spacers.? There is no cover for the clutch thrust bearing stack these spacers are a part of.? The thrust bearings on both axes just live somewhat exposed.? The good news is that they are easy to remove and easy to clean and relubricate.??

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If you would like there are clutch spacer replacements that match the body of the mount diameter available for about $20 a pair.? Largely cosmetic but they may help reduce the amount of dust and grit that can settle on the thrust bearings.? ?

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There should also be a black anodized cap on the back of the RA axis to keep dust and critters out of the RA axis.? I can't make out from the images if it is there.? It looks like the threaded retaining piece for the polar scope is there instead.? If you don't have the polar scope replace the polar scope retaining ring an replace it with the black machined alloy RA axis cap.? If you are missing the cap replacements are available fairly inexpensively.??

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Good luck on your adventure.??

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