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[Buckhorn2]

I am tryin to do a laser adjustment on my tompson drive the tm600 model. i have the pdf file that tells how to do it, i ahve scraped the resin off the pot, and can turn the screw, but the reading always fluctuates. I have made sure there is no  resin on the contacts as well.  The drive still works sometimes so i assume its not totally dead

Any ideas?