Im trying to put my helix back on with the bbk 80mm tb, i got longer bolts @ a machine shop that was the same thred size as the one that came with the tb, they would got into the intake about a 1/2 a turn then would stop. Today i got different bolts at Bombardier were i work and checked the thred size with a nut on the bbk bolt and the one i got from their and the nut threded up on both of them just fine, they did the same as the other ones. Were could i find a long enough bolt to work?