I am wondering which trimmer head comes with the 326LS. I did have a 323L but didn't like the exhaust blowing on my arm (I saw it as a poor design and pretty darn annoying), so the dealer reluctantly upgraded me to a 326LS, which doesn't have the vent cut-out on top of the machine. He switched the guards out and am wondering if he swithed the heads out also. Husqvarna's website specifications states that the 323L comes with a T35 and the 326LS with a T35x. How can I tell the difference? It mentions something about ballbearings. I don't see any ball bearings in the head I have. Also, the T35x is supposed to feed automatically when I keep the head pushed against the ground. Where would the ball bearings be? Any thoughts on this? Thanks.