ORIGINAL: da Rock
Maybe if we can figure out the code he's using, we can find out what he does to find just C/L kits on ebay.
I use this search string in that auction place: Doesn't get me kits only, but it does get me all ukie stuff. The car and helicopter references with the minus sign keep out the unwanted stuff.
(c/l,u/c,u/control,control line) -car -helicopter