Anyway, in the informal group, we have twice drifted off (from the intended content of the day) and played quite a bit with circles to see what kind of locks we end up with. It's a good exercise in experimental learning.
Simply have a partner grasp your wrist. You perform circular motion, inside or outside, standing still, moving sideways or moving in directly or diagonally. Vary the size of circles. Don't forget your other hand. It should be "alive" to help you. I suggest an atemi with the live hand then proceed to assist the "captured" hand to implement a lock.
If you stay outside, your lock will likely be on the wrist. If you go in, you'll likely end up with an elbow or arm bar type lock. If you apply the "live" hand to the partners neck/head, you'll likely control and spin the partner ending with him severely disrupted in balance or down in some type of armbar lock.
You can further experiment from the wrist grasp to straight type punches. You can add a pocketstick or a training knife in the "captured" or "live" hand. The tool will add on elements of leverage and pressurepoint in the lock.
Don't play these fast. Play slow/medium speed and soft. You're just simply trying to see the possibilities from playing. Plus, if you not quite sure what you're doing, you don't want to inadvertantly hurt your partner or be hurt by him/her.
Circles are one of the more fascinating objects of study in nature and philosophy.

david
[This message has been edited by david (edited April 19, 2002).]