I finally managed to get that handlebar throught, mounting stem on the bike helped a little bit, and some opening with screwdriver get the job done. I'm glad I didn't damaged anything doing this, it goes pretty smooth.
@marrac started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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I finally managed to get that handlebar throught, mounting stem on the bike helped a little bit, and some opening with screwdriver get the job done. I'm glad I didn't damaged anything doing this, it goes pretty smooth.