I can use a very deep 17mm socket if it has some way that I can grip the top of it to turn the socket and loosen the nut. I have to simultaneously feed a 1/4 drive connected to a special shock socket down through the 17mm piece to hold the inner mechanism steady while I loosen and tighten the nut. May have to grip the outer socket with a pair of vise-grips or something. Sure would like to have that sparkplug socket from MB though.