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· Distinguished SOTW Member
14,671 Posts
A2 is the spot where the upper octave vent opens and the lower vent closes. Whenever something goes wrong there, the first thing I check is to see if the whole octave system is working properly. I would think a hole in the upper octave pad may cause problems if it affects the manner in which the vent seals and opens. Maybe material from the hole became stuck in the tone-hole. DAVE
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