The other day without wanting to crush one of my whistles and apparently is a little bent but almost nothing.
My question is whether this affects somehow sound or the tuning?
I am very concerned because it is my favorite whistle is a Feadog Jerry Freeman. 
Someone else gone through this?? 
It depends on how severe the dent is, play all the notes and see how they sound. You might be able to remove or lessen the dent by inserting the right sized rod up the bore to push the dent out.
I’ve had a few with small dents and they made no differance that I could tell.
Algo semejante me pasó con mi Walton’s LBW, con su tubo de aluminio muy ligero. Llegó aplastado en tránsito, pero logré en repararlo con el mango redondo de una cuchara de madera adentro del tubo, con todo éxito.
Si eso no sirve … En tu ciudad hay un taller de reparación de instrumentos en latón? Las abolladuras son muy comunes con trompeta, corneta, trombón, corno francés, etc. Y los técnicos tienen los herramientos necesarios - martillos de cuero, mandriles - para efectuar una reparación rápido y probablamente a un costo muy razonable.
Sí, una arruga puede afectar la intonación y afinación, pero tal vez no mucho. Qué te informan tus oídos en este caso?
Something like that happened to my Walton’s LBW with its thin aluminium tube. It was crushed in transit, but I managed to fix it with the round handle of a wooden spoon inside the tube, with complete success.
If that doesn’t work … Is there a brass instrument repair shop in your city? Dents are pretty common with trumpets, cornets, trombones, French horns, etc. And the repairmen have the right tools - leather mallets, mandrels - for an easy repair, and probably not too expensive.
Sure, a crease can affect the intonation and tuning, but maybe not much. What do your ears tell you in this case?
I’ve had two whistles that have improved significantly by being dented in a fall.
Me too. For a long time my favorite whistle was one that had a 20 degree bend in it.
Thanks all!
Well, the second octave now is little “scrachy” and I don`t know, I feel that is no longer the same.
The material (nickel) of my Feadog Pro is quite hard and can not appreciate the very crease, but since I sit in the whistle everything changed, everything. 
i’ve always thought that Feadog Pro’s second octave is scratchy - worse than my regular Feadog!
I feel your pain, man.
http://chiffboard.mati.ca/viewtopic.php?t=8006
Tom