Kind of a side bar thought to this post but worth mentioning. Someone once posted that you could mount an old barrel lens in a wooden lens board by cutting a hole in the boat just slightly smaller than the threads on the barrel lens, and screwing the lens into the board. Threads on the lens would self cut threads in the wooden lens board.... DO NOT DO THIS. I did and the lens seemed secure enough in the lensboad, but after using it a few times the brass lens came free from the wooden board, fortunately when I was adjusting the iris, so was able to "catch" the lens.
Oh god, that's horrifying
Back when high schools taught wood shop, a properly offered box of doughnuts could coax a teacher into drilling you a hole, or even make a new lens board.
"I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit Nature and more time tasting her sweetness and respecting her seniority"---EB White
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