Here is the answer to your worn out K&B 7.5 outboard prop shaft assemblies. In the kit you receive a new drive dog and prop shaft hub. The prop shaft hub and drive dog are CNC machined from solid bearing bronze, no lead Teflon bushing to wear out. The bearing bronze provides superior wear resistance and a long life. It will not loosen up in a few runs like the lead Teflon bushing in the stock unit do. just disassemble your old prop shaft assembly in stall the new parts and reassemble, its that easy. You reuse the prop shaft and thrust washer from the old unit. The instruction provided with the kit explain step by step the disassembly and reassembly of the unit. We also explain how to inspect the prop shaft to make sure it is suitable for reuse. Field test reports will be made available soon. All Test prooved the propshaft rebuild kit is the answer to your prop shaft wear issues. The prop hub is fully guaranteed against defects in material and workmanship for the period of one year. If it fails we provide replacement parts free of charge (customer must return defective parts for inspection).