Thank you.
For future reference, I was able to unwind the valve spring from around the steel striking face (tappet), and gently re-shape it.
Not a perfect fix, and I had damaged the circumference of the metal valve components a bit while trying to disassemble it, so it still sticks, but less often and less dramatically than before.
I'm pretty sure this is just a lemon valve, not much to be done about it.
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