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Did you switch to a 27.2mm seat post on the Pocket Rocket recently? I bought a Pocket Rocket Pro last November and want to get a post with more set back. I thought I remembered my post being 27.0mm. Unfortunately the 27.0mm selection is much narrower than the 27.2mm selection.
In early 2001, we switched some of our bikes, such as the Pocket Rocket Pro, from 27.0mm seatpsosts to 27.2mm.
There are quite a few more options in 27.2 mm but still a good selection in 27.0 mm. I know that Thompson makes a layback seatpost and they make their posts in virtually every size. If you can't find one locally, give us a call and we will try to round one up for you.