While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
Note: This feature may not be available in some browsers.
Permanent loctite (that needs heat to remove) would probably work. If you have a center punch, put two little punch marks on the bottom of the sight blade on either side, NOT the slide. This will force the sight up tight into the dovetail.