So are you saying someone snuck into your workshop and somehow weakend the dowel so you couldn't tell after it broke? Maybe a more reasonable explanation is that you put it in with the grain in the wrong position and when you did a manuver that will rip the wings off many planes it came apart.

I find it hard to believe that just because you are paranoid and accusing people of doing something to your plane that they would think your an A-hole.