Paul from SWISCO responded:
January 25, 2016
Based on what you've described, I don't think the 26-147 is for you. In your case, remove both the and bottom sashes and examine the interlocks between the two. Sometimes one or the other interlock is either bent or dirt has built up to make the two sashes fail to mesh, which in turn causes the locks to not work properly. Also be sure to check your sill for any blockage that could cause the sashes to not mesh.
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