After minutes and minutes of digging thru the 500 knobs in the bin for the 4 I needed for my new bench power supply, I was reduced to but one knob I could accept, and, to my luck there was only 1. After seconds and seconds of slaving over a medium warm keyboard I was able to engineer a matching knob. 9 prints with 7 failures later, I had two of the valued knob. Proud of my accomplishments I went to test fit it and found out its the wrong style knob for the supply. So here, you take the blooming thing.
Please dont use this knob for evil, unless thats specifically what you need it for.

• First you have to print it.

2. Insert a bare metal round disc in the front. or a white disc. or a red one... pink dosn't go well with the black so I dont suggest pink
   c) Fit an adapter in the back to go from the 8.5mm to whatever shaft size your putting the knob on. I didn't make any of these that are printable, you can if you like. I have a lathe, I made mine from aluminum.
   Next, If required the knob has provisions for being drilled for a grub screw, drill and insert screw
   Please enjoy this stupid knob.