I’ve got an old drum machine that is missing some slide knobs. They are about 1 cm tall, 1cm wide and perhaps 1/4cm thick. The part fits on a slide pot much like what you’d see on a small mixing board. There is a picture of one style knob the company used here -the yellow, white and red things. My machine is the same but a slightly different model.
I’ve tried to google parts companies but most the websites I have found don’t include pictures so I’m not quite sure if they’ll fit. The machine these are for is from 1979 and somewhat rare, so the chance of getting the real part is next to zero.
Anyone out there have a favourite electronic parts company they use?