Pipe threads
Rob,
Pipe threads are both BS Electrical Conduit Thread. I have a set that you can borrow if you need them. PM sent. 
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Phillip Thompson
"He who has the tiger by the tale, is often afraid to let go" - Confucius
Ford FGT No.9 (long suffering restoration project)
25 Pdr (Under Restoration)
No.27 Artillery Trailer (Under Restoration)
Bit and pieces of a 2 pdr AT (Looking for bits)
LP2a Carrier - 3" Mortar Trials (Restored)
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