that's interesting, I tried opening up that same angle on a bike that has a complete front triangle, and it wouldn't go as far as I wanted. I was recently looking at that bb shell because I'm using the same one on a new frame, those sockets are pretty robust. Not sure if we are using the same bb shell though.

there is a blacksmith shop near here in someone's yard, but it has been here since 1835. I think blacksmithing is pretty popular, probably more than building bike frames anyway.