That is interesting regarding the vibration. I had a similar problem a few years ago with the motor drive on the Goliath mount. It is nearly 30 years old. I had never lubed the small gear box in all that time.
I drilled a small hole into the side of the metal casing so I could get the plastic tube from chain lube spray into it. Gave it a few seconds spray and the vibration has never came back.
Just a thought, that may help.
ps. I will post my Jupiter from yesterday.
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