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.
Extremely easy. Just loosen off the pinch allen key bolt, you might even be able to do it with your fingers, at worst slight taps. Total elapsed time, less than a minute (once you have the right tools to hand).
Sorry, I forgot to mention that point of the bolt being all the way out. Yes, as long as it's out, you tap the sight with a brass drift, piece of wood, something non injurious, hitting it at the base/bottom. It'll come out.