Awhile back someone showed a tool they made that gave better action to trolled lures by using a disk to catch the top of waves and pulling down the rod and then releasing it causing the lure to dart. It was simply a round disk at the bottom with a hollow tube attached to the center of the disk at a 90 degree angle. A piece of bungee type cord was run thru the tube/disk and tied off. The other end comes out the top of the tube and is attacked to the fishing rod (guide I think) towards the top and hangs down just touching the water. When water catches the disk, it will pull down the rod and let it snap back making the lure move erratically.
The plans for this was shown here. I am looking for that posting because I want to build some. Will someone point me to the post or the guy that posted it.
Thanks