This is the updated all-aluminum SPM1958 Scotty-style single pin adapter, shown with the DM1118 Heavy Duty Deck Mount. Don’t rely on two pieces of plastic to keep your big dollar investments mounted securely. The Scotty plastic mount system was originally designed to hold a downrigger and a 20 lb. cannonball, not a trap hauler with lots of weight torquing on the mount. Then you add the fulcrum point of the boom length to that?
The standalone SPM1958 is $45 and is meant to be paired with the DM1118 Deck Plate is $20, sold seperately.