Sorry for the OT, but where are those knobs available., & are there different shaft sizes sold? Thx!
I simply showed the results of a google image search, apparently a link to the alibaba shop.
here in germany a would look at either thomann or www.rockinger.com. Knobs similar to those are made at least for 6 mm axes, both knurled and press-on and with screw. I would be surprised of there were none in 1/4"
