Thanks Bryan. You've cleared it up a little bit for me - thanks! I now understand a little better the kind of motion that I'm aiming at to push my opponent down. But what confuses me most, rather, is the actual placement and orientation of my hands on the guy whose arm I'm manipulating...
If I could combine the approachability of your reply with the detail of the loquacious Mr Wilbanks ...
"Take a technique like nikkyo for instance - it involves flexion at the elbow, extreme pronation of the radioulnar, flexion at the wrist, as well as binding of some of the intercarpal and carpometacarpal joint at the extremes of their sliding or oppositional ranges... THEN, what really makes the technique "work" is when one attempts to forcibly pronate the radiocarpal (wrist) - a direction in which the joint is not supposed to move."
then I'm sure I could understand the mechanics of this move, as well as its goal.
I'm sure I can work on the further aspects of the technique once I have the basic elements of it down first; I can't improve the force downwards, say, until I know how to hold my opponent's arm in the first place.
Can anyone help me here? Onegai shimasu!