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Thanks. Unfortunately they're £20 and not M6 thread.
The bolt is for the sidecover of my motorbike that needs a coin. Custom Allen key replacements are available for that sort of money. But my thinking was a nut and bolt would be a few quid and give me both socket and Allen key options.
@mdcc_tester
friendly local Tig welder
I need to get one of these.
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Some places refer to them as Dual Drive
Yes, they already exist in the BMX, fixed freestyle and bike polo world.
Like these:
https://www.sourcebmx.com/Mobile/en/Profile-Chromoly-Female-Hub-Bolts/m-m-36247.aspx?awc=6079_1539817462_cb3211bb606588848f8056715b648a16&utm_source=affiliate&utm_medium=affiliatewindow&utm_campaign=UnitedKingdom