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Built a bike for a local kid and the dropper cartridge Tranzx isn’t serviceable allegedly. Anyone recommended a short cheap dropper.
He’s on a small frame that has a short seat tube.
Shim a short 27.2 mm post to 30.9?
https://www.chainreactioncycles.com/brand-x-ascend-kids-mtb-dropper-seatpost-70mm-/rp-prod200308
https://www.chainreactioncycles.com/brand-x-ascend-ii-dropper-seatpost/rp-prod159176
Cartridge may well not be serviceable, but may be possible to replace the cartridge as complete unit for sensible money?
Kindshock KS EXA 900i 30.9 100mm is about £65 delivered from AliExpress
When you say "for a local kid", is this something you're doing for someone in need?