SPB7-20TXN Blender Driver Clutch Description: It is utilized to engage the blade which is driven by the motor，and is designed and threaded to ensure a secure tight fit.Under a heavy load, the Cuisinart Blender Drive Coupling is designed to break or strip out to protect your motor, and is threaded onto the motor shaft. SPB7-20TXN Fits Models: BFP703, BFP-703, BFP703B, BFP-703B, BFP-703BK, BFP703BK, BFP703CH, BFP-703CH, BFP703R, BFP-703R, SPB-7, SPB7, SPB-7BK, SPB7BK, SPB-7CH, SPB7CH, SPB-7BC, SPB7BC, CB7, CB8, CB9, CBT-500, CB-18 series blenders and SPB-6 series blenders and Smart 7-Speed Blender Coupler Clutch Works with the following brands：CuisinartWorks with the following products：Blender SPB7-20TXN Blender Blade Driver Clutch Outer Diameter: 35mmInner Diameter: 5mmAll blender drive rubber clutch are reverse threaded, you need to rotate it clockwise to make it fall off and rotate it counterclockwise to make it firm. Fits most Cuisinart blenders Attaches to motor shaft, and spins the blade assembly How to replace SPB7-20TXN Blender Blade Driver Clutch 1. Disconnect the power cord，put down the blender, and remove the bottom screws 2. Separate the base from the top, remove the motor bottom rubber bushing 3. Use flat screwdriver to take hairline off, and remove broken clutch 4. Turn clockwise to unscrew the brass nut using a flat head screw driver 5. Reinstall the motor back into the housing, screw on the new clutch, and tighten the bottom motor screw 6. Reinstall rubber bushing back on the motor, and reattach the base