Paul from SWISCO responded:
January 23, 2017
I would recommend the 2170 option, which we just added for you. This can carry a sash weight of 34 through 37 pounds.
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Paul from SWISCO responded:
February 2, 2017
The bottom screw head looks like it has broken off. Unscrew the top screw and slide a screw driver under the top sash guide and then try to pop it off. You can then use a pair of locking pliers to unscrew the broken screw stem. The top guide itself looks like the 18-179.
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