Thanks Jesstalkn. I went back and read post #131 plus a few following it. I have a much better idea of what to do now. Still not sure I should attempt this, but I feel a lot more comfortable. I think I'll try one of the back pads and see if it is something my un-mechanical ability can do. At least, thanks to you, I've got pictures and examples to look at.
Keith - if you were at a rally, you'd have elves to do this for you