Aussie,

I had the same problem with one tab on the tank, but even as hard as I stress mine, the only other problem I found and this was last night was the plywood plate on the bottom between the wing saddle and firewall had come loose on one side. I removed the covering, mixed up some 30 minute epoxy and milled fiberglass and reinstalled it. I checked it this morning and it was nice and solid. All i have to do is put a new piece of covering on the area and I'll do that tonight