Abstract: An improved nest device construction for use with insertable ink jet print/cartridges having detent portions accurately located vis a vis their orifice array. The construction includes a U-shaped member, having a handle and arms spaced to receive a print/cartridge, which is mounted on a printer carriage for rotation between insert and retain positions. The arms have interior pinch surfaces for slidably engaging an inserted print/cartridge during rotation of said member and a bottom lip edge that extends inwardly to initially support a print/cartridge in an insert position. A spring is located between the arms of the member to contact the bottom rear surface of an inserted print/cartridge and tilt its front face into engagement with a positioning knife edge.