I just went through that and had an extreme amount of trouble getting the knob end to engage the shaft. The shaft was WA-A-AY to short. Ultimatelly, I drilled out the hole in the lens to a little over the diameter of the knob, then inserted a stainless steel washer over the shaft of the knob to keep the knob from rubbing on the lens. It still took a fair amount of effort to deform the lens to fit the knob to the shaft but I assume that with heat and age it will conform to fit.
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