Abstract: An apparatus includes an air compressor containing a piston in a cylinder, a flywheel having an axis of rotation, and an elongated linkage structure interconnecting the flywheel with the piston. A support member projects from the flywheel. A bearing supports the linkage structure on the support member. The linkage structure has an inner edge surface defining an opening in which the bearing is received in an installed position. The inner edge surface of the linkage structure extends continuously in a loop around the opening, and has an annular portion which is interrupted across a circumferentially extending gap. The linkage structure further has a portion configured as a living hinge which enables the gap to enlarge upon flexure of the hinge. This enables the bearing to be installed in the opening with an interference fit between a cylindrical outer surface of the bearing and the annular inner surface of the linkage structure.