I recently purchased a Smith and Wesson Model 66-2 with a 4-inch barrel. When measured with a Lyman digital trigger gauge I have an average double action pull of just over 4 pounds and a single action pull of about 8 ounces. The issue is that when cocked, forward pressure on the back of the hammer of about 2 pounds will cause the hammer to fall. The general consensus of the people who have handled it is that either some work was done to lighten the trigger or there is something damaged internally. If I knew what had to be replaced or modified, I could probably do it myself with the help of a video. However, I am not as confident in my ability to diagnose the problem. What would be the most likely components that were damaged, replaced or modified to result in this issue? I like the 4-pound double action pull and could live with the 8-ounce single action pull but would prefer if it were a little heavier. I do have concerns about the fact that I can just push the hammer forward. Thanks