Been thru this head ache once before... I'm older and wiser this time around so I already bought an air hammer and need to figure out what exact size the nut is. I"ve found 47mm and then a review on Amazon said the ford manual stated that it was 1 7/8".... I believe the 47mm is slightly small, so if it's too small I can grind it out to fit, but I would rather get the correct size the first time around if possible. Any confirmation is appreciated. Thanks.