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I didn't know they made that version in a Bb horn...
I have a C version, and not everytime I play it, but sometimes, I give it a counter clockwise spin, which gets the spit back to the main tuning slide water key. (counter clockwise meaning, from my vantage point)

hope that helps...
Blake

Corrupt_Reverend wrote:.. it'll play clear for a few minuets...

Be welcomed! Ever more so, as you apparently have experience with a type of repertory not so common for tubists.

Klaus