One other thought before you put the pump back together.
I had a friend that cut the end of an engine shaft to shorten it.
He did not get it straight, the engine had a bushing, not a bearing on the output.
The seal leaked. The mfgr said it was due to the out of balance shaft caused by the angle cut. He cut the shaft straight, the seal stopped leaking.
There is a lot of material ground off one side of the shaft. Could it be out of balance!!?? Put that shaft in a 2500rpm hand drill and spin it, you will feel a lot of out of balance vibration.
Just something to think about as those pumps have very little bearing area and spread.
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