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| p.1 #2 · Replacement knurled knob for TS lens? |
Canon is pretty "tight" with their microfiche, as that's where you'll find the part number and exploded diagrams. I lost the auxiliary plastic knob to the 17mm once and Canon was indeed he only solution to the problem.
It was't expensive to get another one, say $8 including tax, shipping and handling. But, you likely need a metal, machined part which probably costs more? Do post the part number for posterity, when you fix it