Received a set of 6. The bolts used to attach legs seem two short to get the threads started. I have been trying to get the legs attached for the first chair for over three hours and have been unsuccessful. If i remove either the lock washer or the washer, or the black spacer, no problem. the bolt by itself, no problem. but went trying to assemble per instructions, the bolt does not stick out past the spacer so there is no way for it to screw into the threads on the chair. Any idea or can you send longer bolt?