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Hold it up real close to the computer screen so we can diagnose the problem for you. (Sorry, old joke.)

It sounds to me as if the G# touch has been bent and is rubbing against the low B key. If that is the case, pressing the G# could move the B key down with it and if you hold the G# down keep the B key from coming back up. When you press the B key it also lowers the G# key, but when you release it, they both come up together.

How to fix if this is the problem: Examine the key action closely to see where the friction (rubbing) is taking place. Then, using your fingers in the gentlest way possible see if you can pull the G# touch out to where it is supposed to be. You might go a bit too far and leave too big a gap between the G# and the B/C#. If so, carefully push it back a bit.

Occasionally one of the rods holding a roller backs out and touches an adjacent key. Not being able to see the position of the rollers makes it hard to tell if this is the case. Good luck. Hope this helps. BTW that is one of my favorite Cannonball models. The one I like even better is the new "Key Series". :)
 

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Now we're getting serious. If the B key "flops closed" when pressing the G# key and there is no friction the logical conclusion is the it is the G# spring that is holding the B key open, not its own spring.

1. Make sure the sax is upright.
2. Disengage the spring to the G# key
3. Check the spring on the low B key again. Springs that hold keys open are bent toward the tonehole, springs that hold keys open are bent away from the tonehole.
4. Disengage the low B spring, bend it slightly toward the tonehole and then pull it back to catch the spring cradle. Check to see if it holds the B key open---adjust if needed.
5. Put the G# spring back in place.

To set the correct spring tension, lay the sax on its side and set the spring tension to just barely hold the key open against gravity pulling the key down. More than this will make the pinky keys hard to push. Less than this will allow the key to bounce at the end of its upward movement.
 

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Yes, Saxoclese was the 2nd responder to mention that. :=)
I concede. You nailed it first. My problem is I look for the most complicated answer when I should start with the simplest as you did.

P.S. Don't tell my friends at Cannonball I said this but their saxes have a tendency for the bell key springs to come off the cradles. I work on a lot of Cannonballs in my area and I see this a lot. Perhaps the groove needs to be a bit wider or deeper for that diameter of spring. I don't know.
 

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I'm just so thankful to have the collective wisdom of this forum. I don't have a clue what I'm doing (big shock, right?) and with both of you guys chiming in, I was able to muddle through and fix it. Which proves even a blind squirrel finds a nut every now & then.
I called that "the wisdom of the hive" one time, and my friend thought for a moment and said, "Maybe that's why there are so many son's of B's on the internet". :) Good answer.
 
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