Si Wilson wrote:
Can I correct you? "Henka Waza" actually means "Varitation Technique!"
"Henka" for me means "changing from one state to another." In an aikido context, I would personally use it to mean "changing fron one technique to another" which usually (although not always) means not staying within the same technique.
One term I've heard to indicate that a technique is not the basic, "kihonwaza" way of doing that particular technique is "oyo waza" ("applied technique").