I do expect a little more of these switches ... they are currently just customized brushes on top of customized PCB ...

At least these are operating on low voltages and current, otherwise the entire thing will be filled with oxidation marks and black gunk.

If you are here to try to clean the other stuff off the knobs, you had come to the wrong place.

Those are oxidation, my friend, and of course you can grind them off but I'm not going to do it here.

But let's face it -- that shutter button is pretty cool, in any case.