Clarke's original is one of my favorite whistles. The first one I bought I've played so much that the much-maligned gold diamonds are worn away, just black laquer now.
However, every one that I have bought needed the highly technical thumb-mash tweak to be pleasing. From the factory, the windway is very tall, and tends to be breathy, especially in the upper octave.
Each new Clarke's gets a gentle, firm mash with the thumb to close the windway just a smidge, at my house.
So true, Mark! And I've never failed with a thumb tweak on a Clarke original. But every time I tried adjusting the sound blade I ended up putting it back where it was before. So I don't mess with the sound blade anymore.
I bought a Clarke Meg in C once and, because of the longer reach for the lowest hole, returned it. I wish I had kept it now.
Clarkes, to me, are the best cheapies on earth.