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Slipping doesn't necessarily mean new sleeve required, often it can be cured by tightening the pinch bolt a quarter turn or so and/or thoroughly cleaning both the sleeve and post with IPA or degreaser. But yeah if you need to replace the sleeve then you need to ream it post gluing in to compensate for distortion in the seat tube.
geb257
C4r1s
Brompton seatpost slipping = new sleeve time. I thought these had to be installed by a dealer as they needed something doing post install (reaming?), but when I went in they said they were super busy but could easily get one of the plastic sleeves in and it’s a simple diy job at home. Has something changed, or have I always been mistaken?