Celestron SCT focuser knobs

Celestron Schmidt-Cassegrain focuser knobs are hard and expensive to replace. The original one is Celestron_SCT_focuser_knob3.stl. This fits the 6",8" and 9.25" and maybe others. It should be printed with a flexible filament such as TPE or TPU.
Celestron_focuser_01.stl is a one piece item with a larger wheel (literally, I took it from a race car wheel). It too should be printed with a flexible filament.
Celestron_focuser-22mm-Cel.sta is designed to fit snugly over the standard Celestron SCT focuser that comes with the scope. It also fits over the Celestron_SCT_focuser_knob3.stl snugly. It is useful to have a larger wheel that can be removed easily. It can be printed with a rigid filament. The knob was adapted from a knob I downloaded, probably from thingiverse but I have no reference to the original.