Stuart, I had a self-inflicted problem a while back with my MX. Funky mental-on-metal sound at approx 2pm position in RA each time (looking @ MX from behind and facing south). Drove me insane there for a while!
Turned out my homemade speaker wire dew heater straps were far too thick and tacky - with no 'slack', causing a tug on the RA axis @ 2pm each time.
Anyways, my point here - I emailed Sarah Bisque direct. We fleshed it out offline for a while there and, along with Phil's input, put this issue to bed. I've sent you a PM with her email address. She's one of the SB engineers. Good luck! Logan.
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