I agree totally with "bluetopper". IMHO, after a spring is created and sized for a particular job it is inviting failure at an inopportune time to re-bend that spring. But, on leaf springs reducing the cross section of the leaf by grinding off equal amounts from each side is acceptable. Caution must be taken to not over heat the leaf spring thereby re-tempering it to some other than original tensile strength. BUT, in reality, I think the best option is to purchase a set of mainsprings from Wolfe and work with them. .....