The stools were delivered in two shipments.  The first stool was simple, out of the box quickly, assembly done in 30 minutes. The other three arrived the next day when I assembled a second one.  Then the grief began when I found that the third one's swivel mechanism did not line up with the holes as did the first two.  I tried to drill a new hole, I did so and stripped the screw.  One hour later after two other attempts with different screws I decided to take it to a professional.  I picked it up the next day, I came home to assemble the fourth and found that one of the legs could not be attached because of defective holes. Enough already; back to Ross Machine for another repair.
 GJH