I used a rod end bearing to allow 3D rotation on the pedal shaft and some clearance for video. It took a little practice to keep the foot leveled and pedaling straight, but there is a tendency to slip off to the sides. http://youtu.be/ogYbilNrYT4. I also used a tapered bearing to imitate Dirk's Speedplay pedals, and felt a some rotation but there is not much room for observation... Vi