WRD-BNH ยท Bison Spindle/Shaft Bison Spindle/Shaft Replacement spindle and shaft for the Bison assembly, 5/16 in hex drive. Fits Bison assembly Part Spindle and shaft Where to Buy Where this part is used Bison Assembly WRD-BNA → Other parts for the Bison assembly Bison Ball Bearings → 2pcs set of ball bearings for the WRD Bison. Bison Body Components → Replacement Bison tool body components (includes frame screws) Bison Spring Set → Replacement springs for Bison. Deflection Rods → 2pcs replacement deflection rods for the Bison system. Pump Plunger → Replacement pump plunger for the Bison.