Working on my LC Smith Grade 1, 1900, two piece tang, and three position safety. In it's past it had evidently been submerged and was full of rusty crud, so it was taken completely apart. All is well, except for the left trigger. Since how tight the screws are effects how functions work, I need some guidance.

The left trigger feels with typical force of pull that the safety is engaged when it is engaged. But if you pull extra hard on that trigger, it trips the sear. Hammer and sear look well fit, but it seems to fail less if that gun is opened (cocked) with exaggerated force. Tightening the tang screw almost as much as possible seems to help too. However, neither of those two troubleshooting steps yield 100% fix.

I have not yet taken a look with the stock off.

I'm thinking that it's short cocking, but humbly ask for your suggestions. Thanks.