If you think you could have a grip ring stem, but it's just really trapped, you could consider using a huge flat blade screwdriver that will help pry the caster out of your chair base socket. This image has not been loaded. To print the images, close the print see https://autoaccidentattorneysindy28406.blogdigy.com/the-fact-about-office-chair-wheel-tire-that-no-one-is-suggesting-43474329