Ok, um your new here. But let me say this to you as nicely as possible.
If you ask for help, dont ask others to do the leg work.
IE, post a link, dont tell people to find a web site, and then plug in your scope title, and then come back here and give you advice.
Make it easy for us to help you. In other words, help us help you.
And then for your topic. Yes, I would either return the item to the vendor, or I would modify it to work. I thnk the rubber idea posted above is the best one so far. Or just go buy new rings at Walmart.