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Some people say that to properly read a plug you need to cut the threaded portion off and examine the base of the porcelain.
Paul Brodie is a very interesting man. He created the trendsetting Brodie mountain bikes, has taught bicycle frame building and modifies motorcycles. I don't know him personally, but I think he is a very cool guy. He made Excelsior replicas from scratch after studying 4 or 5 photos of them...