Makita 421566-1 — original Makita replacement roller for laminate trimmers and routers. This small molded roller installs on the base of Makita 3707 / 3707F / 3707FC and 3708 / 3708F / 3708FC models to support and guide the tool during edge trimming and flush work, restoring smooth base travel and accurate trimming. The part is a direct-fit Makita part (listed as 421566-1 / 4215661 in Makita parts listings) and is supplied as an original Makita replacement to maintain factory fit and function.