Installing a door closer

A home owner from Chicago Illinois says:
In trying to install the door closer on an exterior storm door, I can't get the piston to move out from the lug. How do you do that?
Morrisine
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Paul from SWISCO responded:
Take a look at the video below, this may offer you some insight on what you can do.
How to Install a Door Closer [1080p]
How to Install a Door Closer [1080p]
VIDEO
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