I know that the washer/spacer is creating the proper distance between front cell and shutter (or say the rear cell)
I was trying to change a shutter (modern copal), but when I unscrew the front cell (with the washer), and put it on another shutter(modern copal). The letter on the barrel turned a certain degree clockwise/counter clockwise. Does that mean the space between the front cell and shutter changed a little bit? (both are modern copal shutters made in the late 90s), Will that change the distance between front and rear cell?