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If it's just a spring replacement it's not a big deal. www.brownells.com should have replacement spring kits for it . It would be nice if the trigger and other parts were polished a bit too but that takes some knowledge ans skill.

Changing springs yourself is easy and cheap. I've done it on several S&W revolvers and it really improves the trigger. I get my springs from Wolff gunsprings. www.gunsprings.com

Give it a try.