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No. 36 MkI filler plug specs

Z

Zamak

New Member
What are the specs of the No. 36 MKI filler plug? I've seen some in brass and some in what appears to be zinc.
Looking, it appears to be a slightly undersized 9/16-20 BSW thread from the two I measured. Anybody know the actual specs? I'd love to find original drawings? Any other info on inspectors markings would be appreciated.
 
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