So I have looked through some posts and still have a couple of questions for re arching leaf springs. I talked to a shop yesterday and he quoted me $150 to rear arch both rear springs on 41 coupe. ($300 to make new springs.) He then asked if I wanted to add a spring. Do they typically add springs or just rearch? My main spring appears to be the one that is really sagging. When you take your springs in to get rearched, how do they know how much to do? Are there questions I need to ask when I talk to them or information I should tell them?