Like other reviewers said, assembly is tricky - some of the holes don't line up, others do. 1 of my chairs was so misaligned that I had to pull hard to bend the frame enough to get the bolt into the hole. Yet other holes are fine. Here's a strong suggestion: the directions do say to wait til all the bolts are in place before tightening all of them down. . . .  I'd say to start the bolts only 50% so you have more more slack to insert all the bolts 1st.   If you get lucky, most of the chairs will assemble ok - if you're not lucky, it'll be a hassle!!  Have PATIENCE otherwise it might end up being frustrating!