GearWrench 10473 Coupler for Distributor Clamp Wrench Replacement Part GearWrench 10473 Coupler for Distributor Clamp Wrench Replacement Part reaches around obstructions to turn distributor lock. Use GearWrench 10473 Coupler for Distributor Clamp Wrench Replacement Part to join wrenches or attach wrench to a 3/8” ratchet or extension. The GearWrench 10473 Coupler for Distributor Clamp Wrench Replacement Part fits 1/2” and 9/16” lock nuts.