Who knows why these nuts that thread onto the bulkhead adjustment bolts tend to disappear but they just do.
Stocked here for your convenience.
These Pyranha nuts have a different thread pitch than USA manufactures typically use (USA companies tend to use 1/4-20 pitch). These are metric size M6 1.0 pitch.
Fun fact, these also fit Blisstick.
Price is for a pack of 4 brass centered wing nuts