HI Gary,
No chop-busting from here....I still have somem of mine from then too.
Remember, we erred on the side of safety since we had young, violent, aggressive, miltary cadets that we had to keep from being broken!
I'll also say this - sometimes a heavier trainer is good as it can destroy bad habits. If the weapon is HEAVY you MUST USE footwork as it is often the only way to maeneuver the weapon effectively. IF it is too lihgt, newer students will tend to 'game it' and if they are strong will try to "physique' the hit, not use appropriate technique. So I tihnk some heavy trainers are always a good thing to keep around - especially longer single hand ones for your "OX" type guys.
I have done the slat thing and they break, I have had some ideas onthe 'bendable versions and I think folks need to make sure they use NYLON tape to limit the range at which the core bends.. then it will be less likely to snap.
Can't wait to see this new design Jake mentioned!
Tim