oh yeah, I failed to mention that as a "mod." I used a very small screw with a big head, and then covered the exposed threads with some fuel tubing. I aluminum is extremely strong and I couldn't break it if I tried (and I did to a certain degree). If it takes a big enough hit to break the rails then either the wings would be trashed and the plane totalled, or new rails are something like $10-15. It's a cleaner design IMO than the dowel.

thanks for noticing,

sachin