}}} What is the purpose of the glass ring? I can see why one wants it to
slip (flagpole) but why not a brass or ss ring? {{{

As long as it fairly "fat" in diamer of material so it won't wear your mono
line unneccessarily, won't make much diff. Glass probably has better
coefficient of friction (meaning less friction) for a given diameter than
other materials.

The tag line scheme is a good idea, too.

}}} Depending on use, the lines usually have to be redone every year. {{{

That's for sure.