How to Add Caster Wheels to a Round Chair

My parents bought these chairs when they moved into their current house about 5.5 years ago. My mom got them to go at the ends of her dining table since she has long benches flanking both sides. However, they have always been kind of short, making them an awkward height to the table. We found some wheels that we liked to go on them hoping that they would give the chairs some height, but initially I didn't think they would work because there was a rubber plate in the way. Well, we revisited that this week and it turns out it is a lot easier than I initially thought!