For the ko problem I have had good sucess with the following. I use a short length (6-8") of next size up pvc sch 40 conduit as a support for the outer ring. If I need to remove the 2" ko I use a 3" support pvc to hold the 3" ring into place on the opposit side my screwdriver will be hitting. Laying the box on the ground I can usually support the pvc with one of my knees. The old Challenger load centers used to have this problem. I made so many calls to the local rep for them that he must have spoke to someone. One day the guy called me and said the cutting die's at the factory got replaced. About 6 months later they closed up shop.
