I just did it for a friend with a TL-S, my friend keeps getting hit with rocks on his lenses. I took a look at the assembly and its easy to replace just remove the metal housing aroung the lense(you'll see that the glass is held in by silicone)just remove all the busted glass get a piece of plexi-glass(should be stronger)cut to fit(with a rotory tool) refit with silicone, let set and your back in business(screw those bastards that want $170+ for a new lense)
P.S. my friend had expels on his lights too!!!
P.S. my friend had expels on his lights too!!!