Yes I agree Tony, here's a photo of an early vacuum wiper motor I picked up for a fiver at a car show last week. It needed cleaning, a stop pin spring and air connection. The starter switch had been kicking around for decades, I'm not sure what it was off but not a Seven, so it was a choice of selling it or making it into a look alike Seven one.
So I used some 3mm plasticard I had to increase the button diameter which is secured with a 2BA countersunk brass screw, it should be 1/4 but I didn't have any 1/4 countersunk brass screws. The shroud is a piece of pipe turned to size and soldered to a base plate.
