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 - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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