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The missing screw is an M5, and was easily found at bunnings. I'm impressed that a mount of this vintage is metric.
I've done some adjustments as per the guide linked to above, which very clearly explains, with photos, what to do. I think the finer tuning will be something I learn as I go, each mount having its own idiosyncrasies.
There's an issue accessing one of the RA worm adjustment screws - the mount for the motor is partially obscuring this, and is riveted in. If necessary I could drill out the rivets and replace with screws or bolts, but I'll see how it goes in the next while before going down that path. The play and backlash are already better on this axis after initial adjustments, so hopefully it'll be ok.
Cheers
Stephen
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