Can highly recommend doing the mod. Its very subtle in effect but I like it heaps. And Matt's explaination is spot on and takes the guess work right out of the equation. Even I had no problems doing the mod and that's saying something.

Side note: Don't forget to plug the socket in to control the original flashers  Had me stuffed for a second when the mod worked but the other flashers were dead. Just too excited to see it work I guess