JWST-CPLR-CLMP An original design machined aluminum 911 coupler clamp allows one-handed tightening of the coupler. For 901/911/915 911s up to 1986. Replaced the bent, distorted original. Two wrenches are required to tighten the original clamp, requiring a third hand to move the shifter. Make this step much easier - with our clamp you can have one hand on the shift stick and the other on the wrench to tighten the coupler.