If you can't find a part for the Pietta, try a hand from Cimarron or VTI gun parts which are for the Uberti. I'd say just buy the spring but the Uberti spring may not fit the Pietta Hand. A Colt SAA spring can be trimmed to fit, as well. VTI is soon to sell Pietta parts. Also check with Navy Arms, as their Armies are Pietta. Pietta also sells repair parts kits, check their website. Cabelas is selling Pietta repair parts kits, for $17.00 you get a hammer, trigger, springs etc, check it out.