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Hello n8080 :)

I'd love to see the pictures of your build when you complete it. And hearing it being played by a trumpet player would be great too.

for the spit valves, you'll need springs that are used for trumpet spit valves; something like this
https://bandrepairparts.com/wp-content/uploads/2015/03/IMG_2056-600x600.jpg
it should be possible to bend a wire into this shape, heat it on an burner until it gets red hot and immerse it into cold water to make it harder and more springy.
and you may take a look at a trumpet or google "spit valve" and many close up photos come which show how the spring is installed onto the valve and the trumpet.