A hairpin type spring is mounted on the body of a print wheel disc provided with an upstanding post of generally cylindrical configuration and having an overhang and a pair of second posts spaced longitudinally from the first post. The second posts are each being provided with laterally opening facing recesses defined as ninety degree sectors, each having perpendicular lateral walls. The spring includes a bend and a pair of branch arms. The spring is mounted with its bend bearing on the post beneath the overhang and its arms within the recesses in the second posts bearing laterally against the recess walls with the free ends bearing axially against said recess walls. The first post and the upstanding second posts are formed unitary with the disc.