My main gripe is the top nut they provide that secures the top lamp shade ring to the lamp (see pic) does not have enough male threading to seat on the lower female connector (below the white ring).  In the pic the top nut threading is basically the same thickness as the white ring on the lamp shade.  As a set, I was able to get one of the lamps to assemble (with some effort) maybe one or two threads caught but the second lamp there is not enough threading to make the connection.  Yes, I switched the top nuts but it would not secure the shade to the other lamp.  The lower female fitting would accept maybe a 1/2" of upper nut threading.  So why they give you a one or two thread margin is simply a quality control "screw-up".