Senco FP18 FinishPro 18 - Gauge Brad Nailer, 5/8" - 2" "trigger assembly diagram" Questions

...trigger assembly, bought from a yard sale, was previousl damaged from an apparent fall. Was able to find the plastic trigger, cannot figure out how the 3 springs are inserted into the trigger itself. ...

...pressure. Having taken apart the head, then the base, it all seems in good shape. I have not taken apart the trigger assembly, as the removal is a total commitment. Thoughts? I could use some