Windshield wipers hanging up halfway

Also- at the neck of the wiper motor is a screw. Almost like the drive gear has a adjustment. With motor unplugged- safety first. Screw that screw into the housing until it stops and back off 1/4 turn. When I had my variable speed wiper motor out for rebuilding I found that screw actually tightened the slop in the motor housing.
This again was for the variable speed motor which acts like a 2 speed motor when the switch is not grounded.
The screw is for small adjustment. Large needs a new bushing.
Keep us posted.
Joe