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I'm curious if the size and number of holes make a difference. It has to affect flow one way or another. If the oil pressure flows into the threaded part and then after the filtration comes back out via the holes in the perimeter, are the smaller holes enough to cause any problems? When I get home I'm going to take another look at them. Maybe there are more flow passages on the very rim of the inside as well. I did not happen to look a them but just noticed while checking the pictures.
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