The Black & Decker 90615429 String Trimmer Motor & Pinion Assy helps restore the cutting power and proper operation of compatible string trimmers. This replacement motor and pinion assembly provides the mechanical power needed to rotate the trimmer head during operation. The motor generates rotational force, while the pinion transfers that force to the cutting mechanism for efficient ... https://www.wholetoolbox.com/black-decker-90615429-string-trimmer-motor-pinion-assy/90615429.html