Step 10: Attach Washers
Fold the washer and insert it into the round hole on the tennis ball with the bolt sticking out.
Push the second washer onto the bolt and snug it up.
The washer and bolt assembly will be what screws into your camera.
Be careful that the part of the bolt sticking out is between a 1/4 and 3/8 inch.
That way it will not be too long for your camera mount.