i just put my c notch in...
http://67-72chevytrucks.com/vboard/s...d.php?t=443217
the cpp notch went in great. even with the lil mods i had to do to make it fit it was still a real straight process. all the things mentioned above are spot on as far as how to do it. and esp the drill bit talk. one thing that helped me, dont laugh, but i never put the support handle on any of drills, and i put it on towards the end and it was soo much easier. doesnt wanna twist out of your hand nearly as much. i wonder if thats what they designed it for hmmmm haha