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The next step is not immediately obvious, but you don't want to drill/cut on center. This is because when you cut the slant on the plug, it will cut through a sphere and the lower lip will end up thicker than the top (see the first photo). With the Blue Streak it is even more important because the original has an off center cup (the top is thicker than the lower rim). To accomplish this you want to drill/cut off center and closer to the lower rim (see the second photo). How much takes some experiment, for this plug about 3/16" worked well.
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Threaded Mode