I thought I was going crazy the first time I assembled this, so I stepped back and gave it a couple days before trying again. Long story short, my chair can’t be assembled past step 2 of the instructions due to hardware issues. 

When trying to attach the small plastic castors to the frame, I was able to get one on easily but the other side won’t accept any of the required bolts. You can see in the photos that I tried all the remaining bolts, and that before they make it far they are being stripped and then stuck. 

I’ll try to get some smaller gauge bolts and see if that helps, but until then all I can say is this chair has been nothing but a source of frustration