Best way to attach 80-111 to the existing threshold

A quick learner from Chandler, Arizona says:
What is the best way to attach 80-111 to the existing threshold? Can it be glued or should I use screws.
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Dave Sr. from SWISCO responded:
Hey, thanks for posting. Glue could possibly work, but if its ever exposed to moisture it could let go. I recommend using screws, that's what I've always done.
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