When I first visited the factory in the early '70s, you could just wander around and talk to the workers. My wife and I stopped at the station where a man was stamping louvers in bonnets. The stamp machine was a very large, tall, hand-powered cast-iron press. The man would take an un-finished bonnet, place a crude looking template on it, measure and mark each louver location with a black marking pen. He would then place the bonnet in the machine and pull the long handle, punching each louver separately, one at a time, lining it up by eye to match his marks.
We asked him how many louvers he should punch on each bonnet, and he replied, "Oh, I don't rightly know--just how ever many I feel like today." Don't know if this is true, partly true, or if he told everyone that.
Maybe this is the answer to your louver question.
Allen
'69 4/4
