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i read this thread , and other threads. I thought about it. And used my experience to conclude the case chamfer is critical for success.
Easy to do with a chamfer bit and a hand drill. This should be done.
At this point in time, I'd think anyone looking here would get the idea that the chamfer on the case, combined with the factory washer with the chamfer is the right way to go.
I know the o-ring is in compression when the through bolt is torqued. Swelling to better fit a proper double chamfered joint is good. Especially because the swelling occurs in time, after the joint is torqued and the washer is in direct contact with the case, without o-ring material crushed in the joint.
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