I've read some of the threads about drilling 9" axle flanges to change the bolt patterns, and I know there are some people out there that think it shouldn't be done, etc. I've got a pretty good idea of a fixture to make sure everything is indexed correctly but I don't know how close I can make the new holes to the old ones. I'm going from 5x5.5 to 5x4.5 and the biggest problem is the access hole is right in the way- of course. There were some people who had drilled to 5x4.75 and made it work, but my templates put the holes pretty close to each other. Basically, I'm wondering how much space needs to be left in between the lug holes to keep it stable. If there isn't enough room, how would a plug work? Would it have to be welded in from the backside?