EK9/DC2R brake caliper to EK

Have done a bit of research but i have found some questions with. Hope someone who has done this before can answer me please.

Quote from Honda-Tech.com
http://www.honda-tech.com/zerothread...&cmd=addnotify

Quote:

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Take the EX/Si knuckle (with bearing and hub) and bolt on the knuckles. Get the caliper mounting bracket, 23T, grinded 3.2mm off of the surface where it mounts to the knuckle. Get 1996 Prelude VTEC rotors re-drilled to fit the 4x100 hub. Take the 17CL15VN ITR calipers, 23T GRINDED caliper mounting brackets, Prelude VTEC rotors, and ITR pads and swap them onto the Civic DX. You can also press the ITR hub into the civic EX bearing, and not grind the bracket, use 97-01 ITR rotors, but then you have 5-lug and will need new wheels. You may use Legend or Vigor calipers, but you should put the right caliper on the left, and vice versa, so to keep the bleeder pointed up.

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1) what is "knuckle" refer to?
2) it said "grinded 3.2mm off of the surface where it mounts to the knuckle", can someone indicate me the point where i have to grind exactly? will be great if there is pic supporting.

Thx