I was trying to get the top nut off the shock on my 97 Deville, but the shaft keeps turning and the nut won't break loose. There is no way to grip the shaft to hold it while breaking the nut loose. I was going to try my air ratchet to see if I can break it loose that way. The manual calls for a special tool. Does anyone know what makes it special? There is a hollow end on the shaft but I do not know what fits in it, I tried allen wrenches to no avail. Anybody have this problem?