Pella screen door latch

Latch is not broken, but does not latch as if it is missing a spring to hold it in place. I have taken it apart, put it back together but still no way to lock or hold in proper position. The latch looks like your 83-115. So is there a spring or something to put pressure on the latch to hold in place? If not can the whole assy be replaced? I don't think replacing the latch will fix the issue unless it's a wear issue with the latch itself. Need some advice. Thanks.