The great debate

Re-arching works two ways. One way is through cold forging. Basically, the spring is laid over a special anvil, and pounded into the arch you want, being measured a little at a time as you go. This is the cheapest method, and as you might guess does not last long. The second is through heat forging. Pretty much the same method, but each leaf is actually heated, then pounded on, then quenched. It's very time consuming, and does last a long time....but both methods are gauranteed much more expensive than a new set of springs.