Funnily enough, I just bought a length of this a few days ago. I'll give it a go. The manual said to measure the float height with the spring not compressed, and juggling the float so that the needle was in contact but not compressed was a bit of a carry-on. And yet the measurement was exactly right to the mm. So I didn't adjust anything, as it was fine before.
I'll do the tube trick anyway, just to see. Thanks.
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