As a part of my training in TKD, I learned how to do some wrist locks for basic self-defense applications. These are quite similar to some techniques from Aikido. However, in practice (during sparring in TKD, and also more recently in sparring in Judo), I find it really hard to do.
Mostly, my opponents are either 200+ lbs and strong or 170+lbs and incredibly strong. When they grab my lapel or sleeves, their wrists are tight and difficult to bend.
Are the wrist locks then better suitedused against weaker opponents in general, or is it a problem with my technique? That is, can a physically "weaker" opponent apply proper technique to do a wrist lock on a stronger guy who is holding his wrist/elbow/other joint stiff?