A handy person from Chicago says:
March 17, 2012
This is a picture of the plungers in all of my screens. Even if you take off the head, the body of the plunger is longer than the 1 1/8 you show on your screen plungers. The length (ex head) of ours seems to be just less than 1 1/2". The end that slides into the hole in the window frame seems to be less an 1/4 but more than 1/8. Please let me know your thoughts.
Paul from SWISCO responded:
March 20, 2012