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@eeehhhh
The saddle clamp has to be just right though. Go to this page http://www.peterwhitecycles.com/pitlock.asp and scroll about a third down to the picture of the seat post tube. The flats where the bolts touch the frame, or seat post collar thing, need to be parallel otherwise it just won't work.
Pitlock do make a seat post clamp that is perfect for this, but it's a bit of hassle. I just use a cable through my saddle rails. It's even more secure than the pitlock anyway because a thief can just unscrew the saddle from the seat post if they're that desperate.