Hi All, Regarding Rick Hageman's posting [201031 MMDigest]:  For
detailed information about the modern Aeolian vacuum pumps, like
those found in the Aeolian Sting II, see

https://www.player-care.com/pump-box.html 

However, based on your explanation of the problem, it's doubtful that
the check valve is the problem. For a listing of common problems found
in the modern Aeolian players, see

https://www.player-care.com/aeolian-list-problems.html 

Musically,
John A Tuttle
Player-Care.com
john@player-care.com.geentroep [delete ".geentroep" to reply]