She will get better wear from the ETD150 bushings. ETD is equivalent to 4140HT (pre-hardened) at Rc32 with better machinability. Flame hardened O-1 would be much harder (high 50s to low 60s).
ETD just arrived. I will strt in the next couple of weeks playing with it. Have to turn 1/2" down to 8mm. Also make a 12mm washer. I will see how it is to work with.
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