I bought a used office chair of the renowned, blue and yellow, the Swedish furniture store. Unfortunately I had to after purchase notice that the pin, which holds the rollers in the frame of the chair, was bent at 4 of 5 rolls such that they could no longer be turning around its own axis. Annoying!
So it was time to turn bad good. And for the chair, the time had come to replace his old, too small "feet" with new ones. With the new large rolls, he takes minor irregularities the better and rolls wonderfully light.
Now I am completely satisfied. Two thumbs up for big things!