I finally got around to changing my front wiper motor after an 'fails to park' fault I'd carried for a while. The problem is a slight misalignment as the wipers go a fraction into the next sweep, but its the same place everytime proving the motor is good .
I'm guessing that I'll need to remove the wiper motor and linkage, attach a wiper arm to the linkage, back it off to the start of the sweep, reconnect the wiper motor to the linkage, and reassemble.
Does this sound about right? Is there any way to identify the linkage is in the start position exactly?