My Technika-style lens board accommodates a Copal Number 1 shutter. I used it with my 4x5 field camera, because the off-center hole gives you additional rise/fall/shift. It is an after-market black metal board that fits perfectly. However, the adapter for my 5x7 Kodak 2A only accommodates a center-drilled board. I would like to trade my off-center board for a center-drilled board.