Dave Sr. from SWISCO responded:
February 15, 2013
Thanks for posting! To increase the strength of the closer you must first remove the main arm of the square closer shaft. It is held on with screw. Remove the arm and then install it back onto the closer shaft at a different setting on the shaft. Try it out once it's back on. If it's not to your liking, reset the arm on the shaft until you do get the proper strength. I believe a lock smith or someone in the glass business who works on doors should be able to adjust this, if you need hands-on help.
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