its all about design,the lip on the front will do most of the wiggle as the water passes over it, theres a book on ebay by a mate of mine,it covers all lure fishing but has a good section on making plugs, 'charlie bettel The art of lure fishing'. should be able to pick it up for under a fiver.another complete tackle making guide is 'The complete book of tackle making' big book but lots on lures.