Both of my retainers (300U and 350U) are smooth on their mating surfaces. I haven't yet removed the old gaskets from the housings so I don't know about those surfaces, but I suppose it's irrelevant anyway as long as the retainer surface is smooth.
I just checked my 7/16-14 tap against the existing threaded (3/8, I believe) holes in the housing. It looks like the tap is big enough that it can't enter the 3/8 hole, so I would bet if you tapped one of the retainer holes with the 7/16 tap, the tap will loosen the retainer when it bottoms against the housing.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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