I'll take a guess: did you loosen the pivot to much, then all of a sudden thwap... no more spring?
A lot of patience. Odds are you will have to take the thumb stud of to set it in properly; this will allow you to push the blade past a certain point out. Its hard to describe, but you will know when it is set in right. It took me an hour or so to re-install. Just don't look any pieces. The extra locking feature can be a little troublesome as well.
Once I put it back together though. It actually fired harder than before.