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.
Depending on size, dimensional accuracy required and materials, almost any decent machine shop could turn tube, pipe or bar (depending on your material requirements) to your desired sizes. It is definitely not rocket science to simply make a custom size of tube.