I just found out that the trigger rebound spring for the J-frame is different from the one that is used in the K, L, and N frames. I thought they were the same, probably because the replacement springs sold by Wolff are advertised as being the same for J, K, L and Ns. My question is - if you put one of the Wolff springs in a J frame, do you need to do anything to it? Like shortening it a coil or two? Is there a source other than Wolff for a reduced strength rebound spring?