Can anyone tell me what the adjustment screw on the side of the wiper motor does on a 1968 corvette?

I'm not aware of any "adjustment screw" on the wiper motor at all. Can you get a pic?

Joel Adams
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I think I answered my own question last night. I finally found someone that mentioned the screw I was referring to. It appears it is an "armature end play adjustment screw". Guess I will continue to try to figure out how to get the passenger side wiper to park further down to clear the wiper door when it closes. 

Thanks

I have taken mine off and moved it down a few notches, and then readjusted the arms and it works better. Still a little high upon closing but the door pushes it down enough when closing. The 68 is so strange and even the wiper motor is different then the others.