Hopefully (usually) the frame will only clamp the post at the clamp, so really, it's probably best if you put a 27.2 in there. Try widen the split with a large flat screwdriver, and see if it's any better.
@Fat_Pants started
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Hopefully (usually) the frame will only clamp the post at the clamp, so really, it's probably best if you put a 27.2 in there. Try widen the split with a large flat screwdriver, and see if it's any better.