The Fender owner's manual for the '72 Telecaster Thinline explains pickup height adjustment as follows: "... the 1st and 6th string pole piece screws should not extend above the pickup cover." The heads of the pole piece screws are shaped like a mushroom cap, so which part of the "mushroom" should not extend above the pickup cover, the rounded, top of the mushroom or the flat bottom? Also, the same manual recommends a starting pickup height of 1/16" on the treble and bass sides, for both pickups. Is this still the case? Thanks, guys.