1magi,
You can get the schematics and parts list here for 99¢:
SMITH & WESSON | | ITEM#PDF0467 | e-GunParts.com
I have done this mod and removed the "pigtail" spring and polished all the appropriate parts in the sear block assembly. A simple mod to be sure. I took it to the range yesterday and it truly has made a very positive difference in trigger pull and smoothness. Much, much better-- still looong- but smooth.
I fired about 100 rounds; not one problem with the trigger resetting. However, I was firing inexpensive factory Remington UMC 115 GR. MC-- nothing "hot".