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February 23, 2019 at 1:48 pm
#168028
The pipe plugs were only on the very earliest RBM’s, I am probably safe to say that after 1913, none had pipe plugs, in fact, both my 1913’s have 7/8 inch threads….those in the 1920’s should also be 7/8 threads…If wrong I am sure I will be corrected
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