This long and interesting discussion has piqued a question: how well or how poorly would a 118 degree drill center in a hole spotted with a 140 degree spotting drill? I ask because I do not own any spotting drills. I've used just the tip on center drills to locate holes for 118 degree drills. That worked very well. I now have 135 degree cobalt split-point drills AND 118 degree drills. I'm considering getting some 140 degree spotting drills to use with the cobalt drills and wonder if I can safely and effectively use the same spotting drills for my 118 degree drills. If not, I might get some 120 degree spotting drills to use with the 118 degree drills and keep the spotting drills with their respective drills in the indexes (120 with 118's and 140 with 135's). If the 140's will work as well with the 118 degree drills, that is less to buy and track. Thanks!