Fabulous chairs!  Deep seat for long legged individual.  Easy assembly.  I recommend assembly of seat and back first then sides.  Once you have the chair together and working on the base, flip to the bottom with the back away from you.  Attach the cross bar base, then the u base that seats into the swivel needs to have the bottom of the U towards the seat of the chair. (enclosed instructions are not clear.)  Place the 4 spacer brackets between the U base and the cross bar.  Once fastened then seat in swivel.  Also recommend to use a long handle Alyn wrench tool for screws that assemble the chair.  Also recommend that you have a couple crescent wrenches.  The tools that come with the parts don't fit the various screws that are used in the assembly.  These are lovely comfortable chairs!