Abstract: An insertion apparatus supplies malleable material into a piston ring groove. An arcuate nozzle is supplied with malleable material under pressure created by a plunger urged by an actuator driven by an electric motor. A rotatable piston nest made of resilient material receives and snuggly secures a piston therein. The rotatable piston nest and piston are movable between a first, retracted position and a second, extended position. In the extended position the groove of the piston ring is spaced in proximity to the arcuate nozzle where malleable material is metered into the groove. Rotational indexing of the piston enables placement of the malleable material in circumferential locations within the piston ring groove.