I have had numerous rainbird popups installed in shrub beds that have required extension with the little screw-on extensions in attached pic. Usually these end up getting broken because of the very short threads in these extensions. They break at the slightest bump. If there was something like a coupling that would go over the screw joint to reinforce it, I think it would last much longer. Will anything glue to that black plastic the popups are made of? If I could slip something over it and glue I think that would work. If I split a PVC fitting and put it over the joint that could also work. Any other ideas. I attached a pic of popup I am talking about. Thanks for any suggestions.