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4ft level is your friend.
Clean and scrape first. Install very dry first to check fitment, then work fast.
Continuous even bead of clear silicone under the inner edges, and wrap it up sides. Finish with matching silicone caulk. Blue tape a stop line if caulking skilz ain't perfect(like mine).
The plastic inserts with bumps hammered in will have some give, and don't spin with proper drill size. Glueing them in place first is even better.
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