Dave, that cleaned up pretty nicely. Please replace that original diaphragm with a new, more pliable one. Original must be pretty stiff and not as responsive as new one will be - think how old that original must be. I should have sent you one, so let me know if needed and I can probably send it in a letter envelope to save the exorbitant package charges to Canada.
Please post photos of the Navy when you have finished!
The older I get the better I was.