The L.C. Smith Collectors Association
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Re: L.C. Smith repair project need advice
I believe the part you are looking for is #53, Forend Retracting Spring. It is under Hammerless Models but is the same for hammer guns.
As for the hammer, the ones from Dixie Gun Works are rough cast. The hole has to be drilled and filed to fit the tumbler, not an easy job. It is best to look at eBay.