Don't know if this will help but I took apart my rear latch wiper motor last week (wagon). The gears were lubed fine but part of the mechanism had become sloppy causing the wipers to stop half way in a stuck position. Tightened everything down and drilled a couple of holes to place 2 set screws. Works like a charm now.

Don

__________________
DAILY DRIVERS:
'84 300DT 298k (Aubrey's)
'99.5 Jetta TDI IV 251k (Julie's)
'97 Jetta TDI 127k (Amber's)
'97 Jetta TDI 186k (Matt's)
'96 Passat TDI 237k (Don's
'84 300D 211k Mint (Arne- Undergoing Greasecar Conversion)

SOLD:
'82 240D 229k (Matt's - Converted-300DT w/ 4 speed