I have a Wessex Dolce, which a copy of the Yamaha 642. When I tune up, my main slide is out about an inch and a half, my 1st valve slide is out about half an inch, my 2nd valve slide (the super short one) is not pulled at all, but my really long 3rd slide is also not pulled at all.
What is the deal with that 3rd slide? Of course, I get why the tubing itself has to be as long as it is, but why is the slide just as long? Is it just a standard thing to match the inner with the outer? I can't imagine when I might need that much slide