A jig is provided for storing setting data of apparatus having a plurality of adjacent slidable setting members. The positions of the members relative to the frame and to each other determines the setting data of the apparatus. The jig includes a plurality of bars mounted on a frame for independent sliding movement relative thereto, and a set screw for releasably holding the bars in desired positions. Each bar has an end face arranged to be selectively contacted by an aligned setting member.
A three dimensional impression pin screen has two parallel axially aligned perforated spaced plates. Apertures of each plate have a plurality of pins passing through them which have a head on one end and a cap on the other. The heads and caps prevent the pins from passing out of the plates given any orientation of the pin screen. Magnetic strips or pressure strips equal in width to the spacing between the plates contact the shanks of rows or a row of pins between the plates. Strips magnetized on both sides are used to contact the shanks of pins of two adjacent rows. Each magnetic strip is longer than the pin filled apertures of adjacent rows. Each pressure strip contacts a single row of pins. The strips are of a thickness less than the spacing between the shanks of pins in adjacent rows which have the same aperture spacing. Pins are held in displaced positions by attraction to the magnetic strips or by resistance against the pressure strips. This allows for a semi-permanent impression to be retained in any orientation of the device until the pins are intentionally displaced to another position.
