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hi art
the initial hole between each bore hole is at a 45 a bit less than 1/2" diameter. then a smaller more like 3/16 is drilled at a shallower angle where it intersects with the one drilled from the other side.
all in all fluid deposited into one bore hole flows instantly into the other
i am reluctant to remove the set screws especially the tiny ones for fear i might ruin the threads. there does appear to be some sort of material inserted into the bleed hole then the set screws are threaded in. this might be something as simple as gasket maker in a tube.
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