Unless the lead screws are worn out, you might take a look at the brushes in the DC motors.
Also make sure you have a good 12V or better to them. Hate for you to put new ones in only to discover a different problem.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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