From what you are saying Ray you are right on top of it. Seeing everything first hand is definitely an advantage.
Some of your comments throw up red flags for you to investigate before you proceed.
That is, the incorrect gaskets and assembly of the banjo: Examine all the parts you have with a magnifying glass to be sure nothing is damaged. Cracked body, stripped threads, crossed threads nicks and like that. I'm wondering why there was the incorrect gasket and assembly? A banjo at its best is not very desirable in my book but that's what you have. If it does not assemble perfectly you will have trouble!
I'm not sure what you bought. Was it the repair kit with the bearing the banjo kit or the whole pump. Do you have a way to test it on the bench, like with a drill and bucket?
JIM