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For now at least I think you need to head into dropper post ownership fully aware of the fact that at some point it will go wrong and either be happy to be sending your post off and potentially paying for repairs (mine is out of warranty now so will be about £60 for a new cartridge I think plus shipping which is about £20 due to the value) or go for one that you can work on yourself.
If you do decide that a Thomson is for you though, yetiman has just posted this morning that he's doing another run of levers.
That's a pain, as Thomsons are one of the more 'reliable' droppers that I've heard of. They're a great idea, but there seems to be no consistency in how long any of them last and they sound more & more like a disposable item.