Self-built gadgets gain in appearance and usability if they are equipped with knurled knobs. A knurled knob signals an old white man that he sees an interesting thing which needs some adjustment.
Knurled knobs are very practical as they save the fumbling with spanners or Allen keys. More often then not, you can replace hexnuts with a threaded knob, provided that the needed clamping force is not too high and knob diameter and grip are high enough.
Most of the knurler designs I have seen at HMT (well over 100) look like heavy duty pliers. This originates perhaps in multi-spindle automatic lathes where the knurling ‚plier’ must engage the turned piece from the side. This is not necessary in the paradise of bricolage. If you modify the plier to a kind of garotte, keeping the knurling wheels in the middle (principle that was used by our members ‚mark f’ and ‚ndnchf’), then the molding of the knurling profile is easier to adjust and the forces involved become much smaller.