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There are many potential issues with used mounts and even more with the now classic Losmandy straight line drivetrain with the 2-piece worm bearing blocks.? There are several places where issues can crop up.? Backlash, bearing blocks square and worm loaded axially no end play, bearings sticking, Oldham coupler set screws, gearbox fasteners, servomotor pinion mesh, servo motor fasteners etc. I'd also look in the drivetrain for something loose.??
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Chip Louie Chief Daydreamer Imagination Hardware?
Astrospheric Forecast - South Pasadena, CA?
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Chip Louie