An improved piston crankshaft interface device provides a stabilized and balanced follower-guide member or “follower” which supports a fulcrum that is created by the point at which the connecting rod fastens to the sliding members within the follower. Sliding members fitted for follower allow the fulcrum to slide with ease up and down, within the follower wherein the movement of the follower is stabilized by attaching members, which fasten the follower to the piston, such that the follower and piston move in unison, as a unit, within the cylinder.