JimmyL: I pounded a 12pt, 15mm socket onto the round allen-head bolt. In order to get the (craftsman) socket on, I had to pull the other two topside mount bolts and jack the engine up, allowing me to fit the socket in between the mount and the top of the frame (it won't fit through the underside access hole). I then fitted an extension bar, 6", and pounded away. Turned it out after that.

The socket doesn't look too healthy now, but I'll bet Sears gives me a new one. That *is* the way they're supposed to be used, isn't it?