Well after great thought I have deceided to revise the plane. The mfg. date on my RB was 8/28/03. I would be a ? mark if it had been modified by TT. I stripped the horizontal and opened it up, sure enough I'm glad I did. I cut the bottom sheeting by carefully cutting the balsa @ a 45degree so when I glue it back on I will have a strong diafram for strength, I cut 1/4" behind the LE and 1/4" in front of the TE. The root rib was a peice of junk it was1/16" thick. I replaced it with high quality 5 layer 1/4" ply. I also duplicated the root ribs so as to sandwich them on the inside of the fuse at the stab location. That area has flex movement and needs to be stiffened. It might have contributed to the high speed flutter and stab failure. The CF tubes are 21/32" if you choose to copy my mods to drill the root rib. Like other owners my CF tubes were to long and had I forced them in I would have broken the seat ribs.I reglued all of the ribs as again they were not done correctly. I will be installing the elevator servo's, HI Tech HS125MG. in each stab for optimum function and eliminate the potential for flutter, it's added weight in the tail, I would rather compensate than crash. I will be adding more comments and photo's as I proceed with this build.