one plastic joint of the wind shield wipers broke.
i replaced the whole linkage, got it to work, the wipers move correctly over the wind screen, but:

the wipers do not stop at the right position on the bottom of the wind screen, when switched off.

what is the correct position for the joiner bar on the linkage, where it is connected to the wiper motor?
and do i have to dismantle the whole assembly to get to the crucial screw on the back of the wiper motor?

and. or: can the wiper motor be reset to a different time?