replacement of dual arm operator sill mount

A home owner from New jersey says:
how to take track slider out from old dual arm operator sill mount?
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Dave Sr. from SWISCO responded:
First off, you must remove the stud located at the end of the long arm from the track slider. The track slider may look like our 39-529. After the arm is removed, you will then need to slide the 39-529 out from either end of the 39-528 track.
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