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Well I thought that I had the belt mod completed but when I tried to adjust the worm mesh I found that the RA belt drive wheel was rubbing on the housing (this despite being installed exactly to the Rown Engineering directions for spacing); not just rubbing but refusing to turn. I had to tear it down again to remove the worm shaft housing and check that, but the spec distances were correct. I then had to machine (Dremel) some of the aluminium from the housing lugs just below the motors on both RA and DEC to get better mesh gear clearance. Re-assembled and both RA and DEC worm gears now rotate freely. This is something that people doing this mod might want to check before they button up the mount.
Second issue is the RA lock shaft brake pad. On my mount there is a small round spacer or sacrifical brake pad that sits on the end of the shaft - only held there by the fact that it's inside the hole and a little grease on it on the lock shaft side. This spacer/brake pad presses against the side of the turning axis gear face to lock the axis. When I disassembled the RA shaft, this locking spacer fell down into the bottom of the mount housing, and I did not see it. When I reassembled the RA the unit would not go all the way down, it was only slightly out, with the setting circle wheel showing too much gap. On disassembly again, I found this small piece of metal spacer sitting down in the bottom of the casing where it was preventing the RA shaft assembly from seating properly. So keep an eye on those little brake pads.
Hopefully today I will get it all back together.
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