I`m looking for a knob for Vageeswari 10x12 field camera. Just the same like on the photo. It seems to be quite tough challenge...but maybe i am wrong ? I count on you !
If you have a friend who knows how to use a metal lathe, it should be easy to make an adequate replacement - looks like a simple piece to make (turn and knurl)
-) at a good metal workshop they could replicate that knob
-) any DYI guy into metal could make you some knob that fits
-) at the DIY market you can find a metrical wing-nut (in case that threading is metrical) and a washer. There you might find knobs with female threading too.