BTW, my height stop on the seat post is lightweight insulating tape :o) I just read the instructions for that really expensive thing on the tat bazaar and improvised - works a treat.
Try this http://bromptontalk.wikispaces.com/Seatpost+Height+Keeper
@dmcg started
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Try this http://bromptontalk.wikispaces.com/Seatpost+Height+Keeper