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Wow – this is a tough one!
Initially, I considered that jerkiness might be an indication of too tight a mesh between drive/worm gears, but upon reading further, this seemed less likely?
Swapping the cables between OEM and Jaycar brands produced a surprising result? Were the Jaycar cables much longer? I guess that differing electrical properties of the cables could affect the signal strength? A weak or intermittent signal might cause the mount to stutter?
Is there a battery somewhere in the system whose voltage is falling below a certain threshold?
Is there a Yahoo Group for your mount – someone may have experienced a similar problem already, and there may be specialised advice over there?
Hope you manage to fix it.
Cheers
Dennis
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