There is a Decathlon in Alexanderplatz, would you be able to get a part there?
Or try one of these places?
http://www.bikesberlin.com/discussion/15/bike-shops-worth-a-visit-in-berlin/p1
It's a proprietary part that's only on Koga track bikes apparently, because it's a weird angled seattube with a thinner than usual diameter a normal seatpost collar or a bodge method probably won't work and might fuck it up. Argh.
@tbc started
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There is a Decathlon in Alexanderplatz, would you be able to get a part there?
Or try one of these places?
http://www.bikesberlin.com/discussion/15/bike-shops-worth-a-visit-in-berlin/p1