....this isn't at all unique to this specific pedal. One solution that FEA Labs used for some of their pedals was to pull the knob caps and put o-rings around the shafts, then reinstall the caps. Simply causes mechanical friction when trying to turn the knobs, but successfully keeps them from from being accidentally bumped out of position.
I happened to be driving by a hardware store today so I took the pedal with me and picked up some o-rings and some flat fender washers. The o-rings fit stealthily inside the bottom of the knob, but required me to widen the inner diameter from whatever it was to 1/4", but it wasn't thick enough to rub on the chassis, thus didn't work. Perhaps two would have but they were really challenging to drill by hand to widen the I.D.
The fender washer was huge, way too wide, but the right thickness to get sandwiched between the knob and chassis, and elastic enough to fit over the pot shaft without requiring drilling. Just needed to cut it down so it wasn't visible. Because it's soft it doesn't give a smooth feel when turning the knob like the o-ring likely would have, but at $0.50 each it's cheap and effective. But it does solve the issue of the Input and Output knobs getting bumped easily.

(ref from 'nother thread), more like I'm...
