Switch, S&W is currently using rubber grips by Uncle Mikes. These grips cover the back strap which will help shorten the pull. The grips also move the hand slightly down which straightens the pull (straight back instead of back and up). I have a pair of these grips that I took of my wife's 637(j frame). I would be more than happy to trade these for your wood grips. Let me know if you are interested. If not, check out the thread " Grips for S&W 642". Good luck.