I have used Butterfield, good drills. I got a deal years ago on sets of drills in a bronze bench stand from Cleavland Twist Drill Co. I bought fraction, number and letter sets. They lasted a long time.
When doing close tolerance work on a Bridgeport I would lock the knee and never touch it after tramming the head. Used a lot of screw machine length drill in collet holders. Grew to like screw machine lengths for their rigidity and found they seldom wandered. Still prefer to sue them whenever I can.
