Down Rigger/ Crab & Shrimp Pot Swivel Base. Simply the best swivel base on the market. Never get a rigger or pot puller hung up with a push pin style base again. Delrin bearing surface insures riggers and pot pullers will always swivel, 32 position gear block with posi lock stainless components . Bert's Track not included. Swivel Mount Downrigger Base.