LLoyd,
This mod is sort of "as needed" in each case. If the filter is close to one pipe, obviously we need to move it away. And by "centering" the filter, intallation/removal is easier.
The photo above was of a "display" adapter modified for the photo. But it is pretty close to what I run and the metal removed is about 1/4 to 1/3 the 3/8" hole diameter.
Note that the slotting has to be made in an arc centered on the top hole, and not simply in a horizontal direction. That is shown by the marked lines near the pencil tips. Much of my work is done "as needed" so I don't have specific numbers for you. But I would not cut clear to the edge on either hole.
Jim Hand
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