So I had already posted the problem with my thundercracker but it got lost in the sever crash and I was too lazy to write it again

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So the problem was that I was unable to transform him because the head was getting jammed in that arched bit. I have none of these problems with my other 3 mp-11 moulds.
So I finally got around to figuring out whats wrong and I have found that the little piece with the ball joint that the head sits on is longer on Mp-11T meaning he can't transform without the head being removed.
Which is fine by me as I have no plans to display in alt mode but its still quite a major QC issue. Ive basically bought something that doesn't work! thanks TT