Thanks Mike. I did'nt realize the NF deleted the 3 man mechanics from their official's manual. I have one thats about 2 or 3 years old. I know they update it every other year so I must have the older version.
http://www.honigs.com has the CCA manuals for 5, 6, and 7 man mechanics.
Also, referee magazine and the National Association of Sports Officials (NASO) has good books on mechanics.