Abstract: A method and apparatus for punching an image-recordable plate with a notch of variable depth or a hole at variable distance from a reference line, such that enable the plate to be mountable on the cylindrical surface of the drum of an imagesetter, with a pin thereon engaging the notch or the hole so that an edge of the recorded image will essentially parallel a reference edge of the plate. The apparatus consists of a punch that includes an edge guide for the plate, or pins to engage registration holes in the plate, and a punching die having a variable position with respect to the guide or the line of pins.