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Re: Seatpost dropper references.
I found this table which links Syncros dropper posts, to the OEM number and available service kits from Syncros which should be available through a Scott dealer or via Westbrook online. The OEM number (JD-YSP23 for example) should be lasered somewhere on the seatpost.
They might have different fixings on the top, like a stud rather than a threaded hole, but they should be compatible.
Disassembled the dropper post. I've found the product code for the cartridge but it seems nowhere online can sell me a new one. Hotlines are the distributor ( https://www.hotlines-uk.com/brand-x-ascend-dropper-replacement-cartridge-598808?106092195 ) but none of the cartridges are in stock. So if I follow the advice of my shop, that's the whole thing going in the recycling, which I'm really displeased about. I've sent them an email asking hotlines if they can estimate a restock.
I found this thread https://singletrackworld.com/forum/topic/where-to-get-parts-for-a-brand-x-ascend-xl-200mm/ where someone went down the rabbit hole of trying to fix it. The best they found was this https://na.tranzx.com/collections/service-parts/products/replacement-cartridges?variant=32036313858083 , a third party dealer who sell bits that do look like the cartridge I pulled out of the seatpost. But there's no guarantee I'll be able to pick the right one that will be compatible with the post and it'll be $75 plus post down the pan for nowt.
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