I forgot about that detail, MountaineerTom. As I said, I have the Northstar version of that battery. If I am correctly remembering (I may be confusing my LJ and Expedition because I put new batteries in both in the last year or so), I had the same problem, and it was because the width of the battery was a little short, so that wedge that you replaced bottomed out on the lip of the battery before the battery was tight between the wedge and the opposite edge of the battery tray. I think I ended up placing a small piece of aluminum sheet metal on one side of the wedge so that it didn't bottom on the battery. The rubber sheet idea is a good idea, too!