Chainsaw Repair

Can you fellows advise on the correct ordering of diaphragm and gasket on this series?  I am doing my first one.  Service manual dated 1984 states the correct ordering when reassembling is gasket against pump body, diaphragm, then cover.  This pump had not been touched since  the factory based on the overspray pattern and it is actually opposite, with diaphragm against body, gasket, then cover.  The impulse channel cast into the cover is large and there is evidence of collapsing and puckering around that large channel.  I gather from searching on AS this can lead to crank pressure loss. 

As it stands, I troweled on Motoseal to fill the collapsed area in the gasket and set the puckered section of the diaphragm in additional sealant.  I did not reverse the ordering as indicated in the service manual.

Any definitive advice I could follow?

Thanks gents,

Cory