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ltc in reply to @JurekB

That might be the best thing to do! I'll see if we have the tool in our workshop at work, if not I'll find a shop to do it. I think @Howard is right about not wanting to remove any material from the frame in those areas but I'm hoping that even a thread for a smaller bolt, fitted in to the existing holes will be fine for the purposes of stopping a plastic mudguard rattling. It can't do any worse than the cable ties currently in use.

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JurekB in reply to @ltc

The wall thickness of the tube, as @Howard states, is almost certainly too thin to tap any sort of useable thread into it. It is the reason why threaded inserts exist.

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ltc in reply to @JurekB

Got you, I didn't make myself very clear but I think you're right that a threaded insert, rather than threading the existing material is the best bet. Thanks for the advice!