How much is too much? I started pulling my motor apart and the pumps are pretty rough- lots of scoring and the gears have some pits and scratches on them. I found some used ones with minor scratches, far better than mine- but don't want to take them if they have to be 100% perfect, I'd rather just buy new or reman units. I'm sure some wear is going to be normal from use, but where do I draw the line? If I can save some money on used, it would be preferable, but not at the expense of my motor 
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