Ah. Sort of like a dead clock it right twice a day?
When you start with a cobbled wiper motor assembly with single speed, farmer connectors, park switch removed and GONE, maybe an Austin motor to begin with, and you get enough partial units in hand to make one full two speed with park..then you figure out how to reverse the field so a LHD motor parks for RHD....seriously....and it works......and the heater works, and the defogger works...but keep a dry rag (for inside) and squeegee (for outside) in the car and you're good to go!