I'm in Quincy, just a few miles above Pike County. My home gun club is the Pike-Adams Sportsmen s Alliance, in Barry, IL. I'm pretty familiar with Pike County.
I bought a drawer chest full of gun parts at an auction 3-4 years ago, and there must have been a dozen mainsprings, and J Frame mainsprings. I'm thinking the original owner replaced springs in every S&W he bought. Springs are like new. HOpe this puts your K Frame back in commission.
You may or may not recall, but I believe I bought an NAA .380 from you several years ago. Great little gun, but awfully heavy, so it was replaced with an LCP then later an LCP2 for pocket carry.