telescope focusing knob

While making Fatalik's ABSDBS 8" telescope I got to the point where I needed a focuser. I ended up making the ABSFCS-1.25 focuser, but it needed a knob. I like larger knobs to give me more fine focusing control, so I sized it as large as seemed reasonable. The shaft I mounted it on is 6mm, so the inner hole dimension is 6.2, please resize as needed to fit your shaft diameter. My shaft also had a cut-away (see the picture) so the knob has a cutaway inside as well, but it will work just fine on a shaft that is round, or you can drill it out. I also put a 3mm set screw hole in the side, but I haven't needed it or used it since the fit on mine is tight, so I don't know how effective it is. Overall I'm very happy with it though, and it gives me the control I want.