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Works, but needs rigorous cleaning first
I bought this for a large bore trombone because the red one I have only fits small bores. I expected it to work exactly the same, but it seems that this one requires quite some effort until it works properly. The one I got keeps shedding blue fuzzy stuff when I rub it through the tube (or my hand, for that matter). It gets less, but even after washing it and cleaning 2 trombones, it still does this. The red one didn't, as far as I can remember.
Stefan-Trompet a 04.08.2018