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Re: CIM Noise
The problem may not be in your motors.
Make sure there is a low amount of friction on your sliding device for upward travel. If it is metal on metal white lithium grease would work well, but requires maintenance and can be messy if you over apply.
If it is 80-20 with those nylon slide plates (which my money for no apparent reason is on) you have to check and see what will affect the nylon. I think the white lithium would work there too.
All speculation
all assumptions
but one big hunch
won't hurt to check it out
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