That's right, those rusted out glide cups and be renewed. You don't have to put up with wrought iron chairs that scrape your deck and you don't have to throw them out. The trick is to find a good welder. You know someone that knows somone that welds. There are lots of people that weld as a hobby. Just ask around and save your chairs.
Wrought iron firniture is a great investment and worth saving. Many people have their outdoor wrought iron furniture sand blasted and powder coated for a like-new finish in many amazing colors.