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One thing that can be done to reduce the apparent weight is the fit the guide-scope closer to the RA axis, rather than as far as possible.
The attached picture is from a website, and not mine. It does however show how Takahashi handle this problem. The main scope is on a flat plate which can move laterally across the top of the mount. Off to one side is the guide-scope, close to the RA axis. The lateral movement allows the slight to one side balance issues to be addressed, and the tube itself balances by sliding fore and aft.
This sort of plate and attachments are not beyond a dedicated machinist, but what Takahashi are the only ones I have seen is beyond me.
Gary
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