I just got my 140L last night. It comes with a mounting piece that allows you to point the light any way you want. That's it on the right.

If you didn't get one and should have, call them up, they'll probably set you up for free. If the light is older and wasn't supposed to come with one, they'll sell you one for $14:
http://store.dinottelighting.com/sha...unt2=963599801