<< I need to know the thickness of the tooth - the narrowest dimension - where a tooth fits into a slot in the pulley. >>

Measurements for the crank-hold tool here is:

Depth or height of tooth: 15 mm
Thickness of tooth: 7 mm

There are three teeth. The outer two are smaller than the center tooth. See image.

Width of center tooth at outer perimeter: 22 mm
Width of center tooth at inner perimeter: 14 mm

Width of outer teeth at outer perimter 18.5 mm
Width of inner teeth at inner perimeter: 10.5 mm

http://s160.photobucket.com/albums/t193/chrisowenvt/?action=view¤t=crank.jpg

Hope that helps.

Chris in VT '94 945 w/ 177K