I hear everyone say "test test test" and yes i test alot. i own several helixes, springs and weights. but i dont know the THEORY. i use xxx helix with xxx spring. IN THIS POST I AM LOOKING FOR FOR SOMEONE TO EXPLAIN TO ME (alot of us) explain how it works, how do i know when to try a differnt sec. spring ???? yes, lower #'s helix grab belt tighter.. ok great ???? stiffer spring, looser spring ......... 8 different helixes and i can get them all to run the same e.t i have an avenger 3 so i see graphs and dl them. GREAT.. if u dont REALLY know how to tune, you have what i have. alot of impressive data that means NOTHING.. thx (yes tony, i would like to have you help me this year)