They’re easily removed for sure. Just a gentle tug and off they come. Mine came from a yard sale and was missing two encoder knobs and the joystick. I had compatible replacements for all three lying around so I got lucky, there. The encoder knobs seem to be a fairly common size as I tried a few from other bits of equipment and near everything fit. I’d bet the faders are also reasonably easy to swap out with others. But yeah, be on the lookout for disappearing pieces!