Turning Point Propellers - 500 Series Hub Kit System - 510 Volvo - 11501000. Replace your propeller housing with Turning Point's 11501000 MasterGuard Hub System Installation Kit #510 with 15-Tooth Spline Hub. This kit is compatible with Hustler and Express Series Propellers for select Volvo Penta AQ 90-300+hp 15-spline shaft engines with a 4.75" gearcase. Turning Point is the only company to offer MasterGuard Installation kits and prop housings for 6-300+hp engines with a Lifetime Warranty Hub. Boaters save up to 38% when buying a replacement propeller housing. MasterGuard hubs are Re-useable most of the time after a prop strike, and if not, they are Warrantied even if the prop is Destroyed. These hubs offer enhanced lower unit protection. Turning Point's MasterGuard Hubs are engineered to withstand typical wear and tear over time without risk of spinning or failure under normal operational use. Turning Point's unique patented one piece hub with glass filled nylon over durable marine b