The chances are the wipers on your Pantera have never been used. The brushes will wear properly as the motor is run. No need to force the issue with sandpaper.
I have found that sluggish operation of mechanisms is due to the 30+ year old grease having become very gummy. My suggestion is to hit all the greased spots with a spritz of WD40. The solvents in the WD40 will dissolve the gummy stuff.
cowboy from hell
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