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Hi Dell
Looks like no one has a wobble/rotary broach. it's a simple job with the kit but 11mm is an odd size, try ringing round engineering jobbing shops they might be able to help.
Regards
Mike

You'll still get galvanic corrosion with stainless in aluminium. It's just the stainless won't corrode, and the aluminium will. The same can be said for common steels, it's just the steel will also...