Where do the Accordion makers buy their "machine made" components? I have a broken "key arm" (it's aluminum)When I opened the box, I see the arm is embeded in a block of wood, but I can't see how. It appears that much of the instrument is hand made, but there are also many parts that appear to be purchased somewhere else and attached to hand made pieces of wood. I own a Sidney Brown.

The arm is usually made up by the builder (not purchased). I sugest you contact Jude Moreau for repair. He has experience with that brand and I think he will have a good solution for you.