I have them in all my equipment.
Here's the way I drill them: Take a Pro-Sect and align it on the centerline. Put the zero mark in line with the center of the two finger holes. Measure out a 20 degree angle down from the ring and draw a line. Leave approximately 1/2 to 5/8 of an inch between the edge of the ring finger hole and the edge of what will be your pinky finger hole. Drill the pinky finger hole a short depth (although this is an opportunity to take out finger weight if you so choose) with 0 forward/reverse and lateral equal to one-half of the pitch of the ring (i.e., if the ring is 1/2 away, the pinky will be 1/4 away). This will ensure your pinky hole doesn't hit the ring hole (which can happen, as I can unfortunately attest).
Jess