I put aside my Clarke's D for a few weeks, for trivial life-related reasons; when I started playing it again I found that all the minor niggles I'd had with it had got much worse. Specifically, it always was quiet in the low register, making it hard to hear what I'm playing in a session; now when I play it at home it has trouble competing with the fridge. The windy mushiness of the tone on some notes is much worse, too, & seems to affect more notes - it's spread from the cross-fingered C natural to the E and F above.

What's going on, and what can I do about it? (Apart from getting the Feadog Pro I've had my eye on in Hobgoblin, that is.) I've tried bearing down on the tinplate over the airway with my thumb, but I'm worried the sides of the whistle are going to bow away from the fipple if I press too hard.