Abstract: A driveshaft having a square cross section for driving the paper feed tractors of an impact printer fits, at each end, into the square sockets of a bushing assembly and a gear and hub assembly, respectively. The bushing assembly has an outer circular bearing surface at one end and a raised shoulder at the other end, the bearing surface rotatably mounted within a journal bearing of a first bracket assembly that is mounted on one sidewall of the frame of an impact printer. The hub of the gear and hub assembly is rotatably mounted within a journal bearing of a second bracket assembly which is mounted on the other sidewall of the frame. The first bracket assembly is mounted on the outside surface of the sidewall and the other bracket assembly is mounted on the inside surface of the other sidewall.