Well I got my Williams Foolproof sight in yesterday and the tang is down at the gunsmith getting a hole drilled and tapped in the tang.
One word of note however. I will be calling Williams Gunsights shortly. The directions tell you to drill and tap one hole using a #31 bit and a 6-48 tap on T/C Hawken or Renegades made after 1991 (when they stopped putting the third hole in the tang).
Then the boneheads supply you with a 8-40 screw for the sight and no 6-48! But understandably the 8-40 would have been the installation screw for the third hole if present.
Hopefully the GS will have the tang ready for me to shoot it over the weekend.