shot peening a distributor gear for a roller camshaft

Bronze Barracuda said

Yeah I called them this morning, but they have no shafts available to mount them on. I think I may try and press one of my old gears apart from the shaft

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Just do that. Make sure you take a measurement of WHERE the gear is on the shaft so that you can locate the new one accordingly. If you want to pin it, they can be easily drilled and pinned. A standard roll pin will work fine. I don't know what size roll pin. 3/16" maybe?