This has come up on some other threads so I though I'd put my 2 cents in on a different thread. There is a lot of discussion on whether the slant of a HB pickup relative to the strings and of the height of the pole screws matters. After giving it some thought I don't think it matters. The humbucker pickup has a magnetic circuit and an electrical circuit in both of these circuits the elements are in series, that is the same magnetic flux flows from the magnet north pole, thru the slug coil, thru an air gap, thru the strings, thru an air gap, thru the screw coil to the magnet south pole. A nice series arrangement. The coils are also electrically in series (at least in normal HB configuration.) So in a series circuit it doesn't matter what order components are in or where modifications to a component are made since the same flux, or current flows thru all elements. If you change the gap height between the slug gap, or the screw gap, since the same flux flows in both it doesn't matter.