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young_gun
M_V
Threaded bmx bb was a thing for a while.
It was called 'euro' and it was pretty shit.
The small shell and large axle meant tiny bearings which didn't last long at all. I remember mates with euro frames going through a bb a week.
If you must do it, use a crank like a Profile that has a 19mm axle as opposed to cranks like Primos that use 22mm axle.