Speedy,
you need to understand that a lot of what I do is not just aikido, but jujutsu and a lot of other "blended arts" as well. For instance, I teach 5 different ways of doing Sankyo, three of which are basically Chin Na methods. My system of jujutsu involves "spiraling energy" and using my methods, I can usually point someone's energy toward the ground and they go there... about as violently as I want them to. As an arrest technique, I would use a wrist pin, click on a handcuff, and then tell them to put their other hand behind their back as I cranked the one I had locked. Worked like a champ.
If you're disarming someone, don't focus on the weapon. Focus on their wrist, and gain control of that. If you're using a baton, don't hit their weapon with the baton, hit their wrist or the back of their hand, even with a backfist strike to open up their hand. I've had people tell me that you can't make someone open their hand, but they don't take well to me helping them close it either. Grab the inside of someone's fist and make their fist tighter, and you'll get immediate reactions.
The most common thing about setting someone up for an arrest is to keep them off balance. Basic judo training teaches that it only takes a few ounces of pressure at 90 degrees to your feet to knock you off balance, so use that to get somebody moving for your arrest techniques.
If you want to pull somebody off balance from the front, grab their wrist and pull it to your body, then grip under their elbow and pull it to the center of their body. As their elbow bends, lift it up, and you can slide into a triangle lock that miraclously looks like shiho nage.
Like I said in my PM to you, most arrests depend on getting the suspect on the ground and then applying body weight in "uncomfortable places" for forced compliance. If you're interested in some of the jujutsu ideas, you might need a little schooling in "spiraling energy". Go to my web community at
http://groups.msn.com/MunenMusoRyuJujitsu and you will begin to see what the body acting like a spring is all about. It's in the "discussions" area.