[Oldbluoval]

Not as simple as written and .....likely not the spring
Those latches are really not a good design
There is a slide pin that the plunger works back and forth on when moving in and out
It wears quickly and the internal part needs to be welded up and the slot re-milled
Also the square where the plunger exits the housing wears and needs to be re-sized
Then there is the bigger dilemma that is even harder to fix....
There is a bronze square that the handle actually rides in and makes
The handle attach to the housing. Often that comes loose and will allow the handle to droop as you write. It can get so bad that the latch will not actuate (function) That takes a major disassemble and one needs to have experience.
“Don’t try this at home”!!!!