When I was attaching the bottom bracket to the seat whatever nut is inside the seat broke loose about halfway in as I tried to screw in 2 of the 4 bolts required to secure it. As a result the bolts just spun around without tightening. I finished the assembly hoping it wouldn't be a big problem since the other two bolts screwed in tightly like they were supposed to. However the final result was an unstable uncomfortable chair. Staples took the chair back and issued a refund with no hassles.