Thanks Devon, I'll try that out your suggestions particularly "the pinky to centerline". That could be very useful given I'm small sized and I can't always easily get my hands around uke's.

Here's another note: We sometimes refer to this as "pinky to centerline". If you take that pinky and drive it toward and down the centerline of the body it will create pain no matter where the hand vs shoulder is place. You can do this with your partners bent arm or straight arm. If the hold is below the elbow (>) then you would grab the elbow with your free hand and pull the elbow to you. Pressure points: Also when applying Nikkyo you can press down on the funny bone. It is a pressure point that makes the technique more painfun