I am presently using a straight back chair. I had an armless office chair on wheels. I obsolutely love it, but it picks up anything/everything I might drop on the floor in the wheels. I try to put all my threads in a bag, but it is amazing how many the wheels find. After a while, the wheels won't roll until I clean themout. You wouldn't believe how much can get stuck in those wheels and it takes pliers and sissors to get it all out. Anyone know a way around this problem?