Originally Posted by spunkyruss
I don't know the dangers of heating the BB shell up to approximately 800 degrees F, but maybe you could use
Dura Fix aluminum brazing rods to add some material to the BB shell and have it retapped for English threads.
Heating the frame will anneal (soften) the aluminum and take the
Heat Treatment out of that area.
I don't know what BB you are using, but I would see if the threads
could be chased or retapped by a mechanic/machine shop first.
If not I would ream and retap Italian on that one side and buy an
Italian E-type cup and use a BB spacer if needed.