Quick one - the two screws (2.5x12) that go into the rear bulkhead via hollow balls just won't bite. I only noticed once i used the traxxas wheelie bar (with replacement 2.5x14 screws). I'm guessing the only remedy is a new rear bulkhead? annoying! Anyone else had this issue? Also, is 7029x the latest version of rear bulkhead as i saw some people debating it? Cheers..