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@terryives
I have in the past repaired many vintage and veteran bikes and the only way to succesfully repair an alluminium thread is to build it up employing the tig welding process and then remachine the thread to standard. If one tries to weld aluminium to steel it will not sucessfully produce any type of good weld. The steel has a higher temperature of melting point and the ali has a lot lower, the steel has carbon in it and the ali dose not, hence a crummy weld with no strength. This is what 30 years of welding has tought me