I recently purchased a Capri 26 with a non-working Whale Gusher Galley Pump MK3. I ordered a rebuild kit but when I disassembled the pump all the diaphragms and seals were in good shape, there is just no return spring tension. Looking at the Whale exploded diagram it appears that I'm not missing any parts but it would seem that the end pieces that hold the diaphragms to the lipped cylinder should be fastened to that cylinder in some way. Mine aren't. The one end cap has a bolt and nut going through it with a seal inside but the spring just pushes that piece against the end piece of the pump. What am I missing? Is the piece with the captive nut supposed to be part of the piece that goes through the lipped cylinder?