• I had the same problem.
    When I went back to Leader with this problem they told me that you are supposed to break in the seat-post clamp. A bit late for that now I imagine. You can do this by tightening up the bolt as much as it will go 5 or 6 times. This seems silly to me, and it would be helpful if Leader made it clear that you are supposed to do this before installing the seat-post.
    For now I am using a bit of a can as a shim, it works.
    Leader sent me another frame in the end, (to shut me up) it has a dented down-tube. I have been trying to contact them for weeks now to explain that I would like just 1 frame without any dents or defects but they are now ignoring me completely.

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