Patrice’s measurements are close. There were minute differences between mine. I took my NOS Large Assembly (female) and measured it. OD is 55.84mm. ID is averaged out to 26mm, but interesting to note that the top ID was slightly smaller than 26mm, and the bottom ID was slightly larger than 26mm.
Small Assembly (male) OD is 2mm less.
Don’t take these as “the” measurements, because there could be slight variation due to machining, cleaning, wear, etc. But that is why I used the NOS one for measuring.
I don’t know what Russ was provided, but I believe Serafino/Howard provided him measurements. You can read about the first accurate run here: https://www.therpf.com/showthread.php?t=10113&highlight=Serafino.
I calipered my Roman converted NOS male late last night while still pining over seeing that Junkyard Hales literally as the first “PM Sent” message went up. Bloody job! Now the cuts on mine will forever appear slightly curved and overlong. Lol!
Anyway, at 3am EST, the BP dimensions were: ID = 26.0mm at the bottom (didn’t think to do the top); OD = 55.8-55.9mm (I’d have to be awake and level the part and calipers to do any better there).
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