Dremel, since purchased by Bosch, has discontinued producing some on/off replacement switches for some Dremel rotary tools manufactured over 25 years ago.
Kauffman Family Tool had 2 NOS switches in stock and emailed images of both to confirm their correct application. From where I'm sitting no other online company carried this particular rare switch.
Kauffman Family Tool runs an essential business the way most American companies used to operate long before computer algorithms changed the business model and eliminated the emphasis on customer service.
Suffering the humiliation of dealing with a dehumanizing monolith like Amazon is no longer required. Kauffman Family Tool Repair now has that power and it's doubtful Amazon will ever come close.

I searched all over internet for a replacement blade for my old B&D jigsaw and had all but given up when I came across the Kauffman Family website. Thanks to their wonderful supply of spares there's now one less machine on the scrap heap! Thanks Kellie!!

I needed a left fence for a 30+year old Hitachi combo chop saw and found plenty of "hits" searching for it. KF was the only one who actually had the part -- at a fair price and great shipping. Plus, when I got my dyslexic fingers screwed up trying to find the part to order it, a helpful voice on the other end of the phone line talked me in. Plus, they included a SweetTarts cousin in the package. Two thumbs up.