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8_10 Brass Cleaner

Bowman safety valve questions

As I do not have any thread gagues to hand, can anyone tell me what thread is the safety valve on a Bowman?

I'm getting my **** in gear to make the parts to put my incomplete Bowman Swallow into working order.
MFSteam

I think they are 5/16" BSB
8_10 Brass Cleaner

MFSteam wrote:
I think they are 5/16" BSB


Thanks for that, but curses, BSB. I will have to invest in a tap (or make one)!
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