Princess oven timer knob

My parents in law have a mini electric oven from the brand "Princess", and one of the knobs broke, the one on the right to set the timer. After several attempts, this is finally a design that works. It is hollow around the axis, except for the tab that enters the axle slot. This way I could see where I had mechanical interferences and with what. Now that it works, I could go ahead and fill it in from the outside.
I'll leave that for later.
I designed it on sketchup, if anyone is interested I c