Hello MMD.  My friend, Jim, who rebuilds players for the only
remaining piano shop in Hobart, Tasmania, has a problem.  He is
working on an Estey player with an Amphion action.  There are three
small boxes at the back of the spool box.  Each box has four tubes
connected to it and each pair of tubes has a cut-off pouch associated
with it.  The same exhauster tube services all three boxes.

Jim has no idea what these small boxes are for.  Can anyone help?

John Phillips - in Hobart, Tasmania