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  1. that seatpost bung has nothing to do with stowing your seatpost inside the frame. it functions as a stopper / brake pad to keep the bike static in folded mode, also protecting the seatpost flare from slamming the floor hard if released accidentally.

    go look at the video on how to fold brompton properly again and follow the steps. u might have skipped / mixed the steps, likely

  2. If it’s fallen out – go to your dealer (Brompton dealer that is)

    It’s not available separately- Brompton said it can’t fall out 😉

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