The “stopper” detail might be kind of hard to get with a welding operation.
another product (German)
But carefully check out this remarkable old image … it’s huge. But it’s still an enigma… If there is a mandrel on the inside how do they get it out, and what forms the end detail that the stopper fits into…? In the top photo, it looks like there is a black insert for the stopper that is inserted into the vulcanizing mold, but that still leaves us with how is the interior formed.
Photo identified as B.F. Goodrich, 1939.
