The Chairs are great, the instructions for putting them together were a nightmare, so here is a tip for others. The instructions tell you to put the washer and the Lock Washers - Split Ring together which you could if you want to go insane and not have the screw fit into the chair, so in some instances you will have to put the washer and the Lock Washers - Split Ring on after you put the screw into the metal portion, other wise it wont fit, and yes the screw head can almost and in some instances again fit through both holes. So just be wise about how you lock em in.   I do love the chairs but the instructions and the heads of the screws should be big enough to not slip through the metal bracket/hole it's meant to fasten.  On that note, have  look see. CHEERS, Shoichi