This is very subjective. You cannot have the same finger pressure simply because various key combinations activated by one finger are sometimes one sprung key and other times 3 keys in some cases. There is a blending and rule of thumb for adjusting spring tensions to hide the differences from tactile feel for these scenarios. So to be technical, yes, the same pressure can be applied to all keys to make them seal and yes you can still make an instrument feel even by compensating for different finger strengths and combinations..Should the pressure required be the same for all the keys?
Springs only need to be replaced when they are broken. Spring tension is something that can be adjusted rather easily but pulling more of a curve in the spring. That will increase the tension. It is very subjective as to what a particular player likes. But if the spring is not broken, then you should be able to adjust it pretty easily. Phosphor bronze springs on some student instruments tend to be harder to increase tension sometimes. But most stainless steel springs are easily adjustable in either direction. (heavier or lighter feel)..Occasionally she will remark on how quickly a particular flute will respond mechanically. I surmise this may be related to the action of the springs, given the related mechanical parts are in good shape. Might this indicate that some springs may be getting weak? How can I tell if a spring should be replaced? A lot of these instruments are 15 to 20 years old.
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