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Just attempting my first ever service of a pair of, well, anything really, but these are SIDS. The wavy washer in the air stack is snapped.
It seems to be about 27mm OD x 24mm ID ish. Is this a ring-TFT thing? Or does anyone know where they're available from?
Thanks!

It's a wave spring washer, you'll likely get a pack of 10 for less than TF want for 1. As long as the dimensions (mind the thickness) are the same it should be functionally identical, it'll just be for preload purposes.
Thanks for that. I'm hunting around looking for the right dimensions and really struggling to find a spec or, given that it's probably a 24mm internal diameter, trying to find an external diameter that'll fit in the tube...
Any pointers anyone? I can see something like it in the "full service kit" for £30-odd quid. Or someone's selling an entire airspring side including the washer for 25 ish on the bay.