The lens board, it is very small, just exactly the same size as front stand's inner circle, nearly 62mm in diameter.
|From My Polaroid 110b 4x5 Project|
Hole in the lens board is 32.3mm in diameter, just fit for the thread of back lens element. I tried two ways to mount the lens, one is taking off the tiny screw on the back of shutter that for preventing lens rotated when operating; another way is to file a dent on the side of hole, to accommodate the screw on the shutter, either way will done, but I prefer to file the hole.
And the hole, got a thicker "lips" around it, about 0.1mm, for preventing shutter totally touch with the board, that will make iris controller scraping the surface of board.
Made in 3mm aluminum alloy, and surface hard-anodized in flat black, I tried to keep the board as simple as possible.