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trying to find an aero inline seatpost
The jury is out on whether "aero" seatposts are any more aero than round ones anyway. The proprietary ones on serious TT bikes are obviously a no-choice item, but stuff like USE, Alpina Wing and Giant have been known to test worse than round posts. Not sure if it's the generally horrible leading edge profile of those posts or some interaction with the thighs.
I just bought a 3T copy off of eBay for £12 posted. Will let you know how it fares.