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I see you have a conical polar axis with a large disk at the top of the cone just below the fork - are you using a roller to drive in RA via that disk ?
Reminds me of a massive steel fork I once made for a 12" Newtonian I once had... while it was great at first I found I found I couldn't stop the rust getting out of control and leaving the OTA outside was really really bad for the coatings no matter what I did.
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