It ain't likely to happen with just a spring. If you really want 4.5# pull, a smith will have to work over your hammer & sear a bit plus refit the thumb safety after fitting the h/s. Shouldn't have to mess with the spring then. Not a real good idea anyway. Wrong approach to the job. Good luck & God bless.
<font size=-1>[ This Message was edited by: BBBBill on 2001-11-10 13:17 ]</font>