For more localized pain more precise acupressure/puncture is used.

The point is on the line which goes down from the middle of the axilla

and is located halfway between the 11th rib and the axilla[the 12 the rib is the last rib]

To get an idea look at the video: start looking at 12.22 of the video to find Sp 21

Let me know if it was of use to you.

axilla is

בית השחי