Ok…
i pressed the blade a bit with my thumb and tried the Whistle,
I am very new to whistles so its very hard describing in professional terms…
a tiny bit of the breathiness has reduced (really a bit) , the thing that i notice the most is that the higher notes (second octave) are easier to produce now 
that was the main defect, i had a really hard time while playing high notes,
i pushed a bit more 
same change just a bit more…
so i find my self sitting, giggling, pushing down the blade ,raising it a bit with a knife,
exploring the physics of the whistle (very interesting)
getting a nice little improvment, afterall as u said it would still take a lot of air no matter what.
enough, i think thats the most i can do, ill play a while on it before ill let u know how much it improved, if…
but , another thing happend,
after doing this little adjustment, i raise my head and what do i see…
the next victim 
my CLARKE

common little clrake lets fix ur little appitite for air

well, here ends my experiance with tweaking whistles.
i think i damaged my clarke, it has a new voice added to its beautifull sweet voice 
its like a little new whizzz…
this is quite a shame because getting a new whistle in israel is not the easiest thing.
anyway,
Thank u paul, U have helped me a lot with the shaw.
jerry - after reading a little about ur tweaking history here in the forum i
am really interested in sending u the whistle, but, the price of the
postage is somewhere near the price of a new whistle, so… im
still considering.
beginners - Think Twice Before Messing with ur Whistle
enough with fixing workshop and chatting, ill just go play a bit 
Happy Purim to ye All 