Bought this: https://dfh.fm/products/voron-v0-display and the encoder doesn't match the original spec from here: https://github.com/VoronDesign/Voron-Hardware/tree/master/V0_Display/STLs

So one of these fits it. They're small enough that they don't cost much filament, and you can try the one that fits until it presses on nicely.