I got this knife as a used one, but the action is so bad I am not able to open it with one hand, I even have very hard time opening it with two hands. While opening it sounds like the pivot is way overtightened, so I disassambled it and it turned out all the pressure comes from back spring. Is there any chance to make the action nice again? I was thinking about making the contact point on the spring more curved so it doesn't have that large contact area, but the problem might be somewhere else. The side bolts are also not too tight, so the spring has plenty place to move. Any suggestions?