When I recently purchased this organ, I replaced the broken pedal straps and the exterior exhauster flap valves (the leather was rotten and they were falling apart). The organ plays and sounds great, but the bellows only hold air for about 10 seconds after pumping stops. I have tracked down the air leak to the interior exhauster flap valves.

The bellows and exhausters themselves have been re-done (ca. 1972) and the rubber is still in great condition (all is air-tight), so I am hesitant to tear them apart to get at the interior flap valves. Furthermore, the front board of the bellows reservoir is glued in place to the board that the upper action sits on.

Does anyone have any experience with removing glued-in-place bellows? I want to replace the valves with new leather, but I don't want to damage the organ in the process.