Bob, the binding appears to move some and it also has a concentric bind. The lock nut to bottom of table spindle has three screws, and another two slotted nuts going into counterboars of casting base. i'm fairly sure i bought this through JL last yr. I was hoping it would be a little better than the other units but recall the fear it would be identical and only costing more ! The unit has no identification on it at all, but the book says tsl 200mm. As with everything else i've seen from china, i'm sure it needs deburr and cleaning inside so it will get opened up this morning. Right now i think i'll order a servo motor & encoder & a gecko too. I wonder if there would be any advantage to getting the new 340 unit ?