[HO455]

The 3rd part of the washer contacts, the button.
The second photo shows the contacts cleaned and almost done. (The button is just sitting there for the photo.) Notice the groove (Red arrow) I still need to repair. This amount of wear usually requires some silver solder to build up the missing material, but this time I only needed to file and buff the contract and it worked fine when tested. It being spring loaded and floating on 3 points of contact meant the the missing material wasn't critical.
The switch is pretty well engineered in that once the shaft is installed correctly (Photo 3) the rest of the parts fit only one way. That being said after 50 years of wear it was possible to reverse fit some parts due to wear. But careful inspection during reassembly will prevent this.
Notice in photo 3 the TEE on the end of the shaft. Each side of the TEE is a different size. The plastic body that holds the contacts matches the TEE, or at least it did when new.
In the 4th photo see the red and ochre lines showing the how the TEE aligns, and the green lines the alignment slots for the contact disk.
Hopefully this will help someone.