Brownell's S&W Hand Torsion Spring

Top-quality Brownell's Smith and Wesson hand torsion spring fit the following:

FITS: 31, .32; 32, .32; 34, .22; 36, .38; 37, .38; 38, .38; 42/442, .38; 49, .38; 60, .38, .357; 63, .22; 631/631 LS, .32 Mag; 632, .32 Mag; 637, .38; 638, .38; 640, .38; 640 Magnum, .357; 642, .38; 649, .38, .357; 650/651, .22 Mag; 940, 9mm