comments:
I had this same problem. Since I wasn't the original purchaser of the lockset - it came with my house - Schlage wouldn't do a warranty replacement for me. But I was able to repair it using this spring (FMTB-MSNH-17). At time of writing, a 5-pack cost me about $20 delivered. I'm sure many other torsion springs would work as well. The one I got is slightly too tight around the shaft after the spring is tensioned, but it works fine. The top piece/collet is a simple press-fit and is easily pried off with a screwdriver. Replace the spring, then press it back on with a pair of large pliers. Secure it by re-bending the tabs. I did this by placing a large flat blade screwdriver in the grooves and striking it with a hammer. Anyway, maybe this will help someone else in the future.