On my old Infiniti I bought a new mask/teeth cable, and let it catch the motor, but I haven't tried it on my old LS or SC yet. I've just replaced the unit and installed a new one-but the motor was gone so i had to.
You could try to open it up, and adjust it, but my solutions are generally to bite the cost and replace the unit, if it's annoying.
Oh, I finally came across that Thread you were referring to about the WD40. Wow!!!