Overall very sturdy chairs, they are also comfy to sit in. Screws on the side of the chair are not long enough even when the instructions say apply force to that area so the holes will be closer together. Only way I can see this not being an issue is if they supply longer screws or clamps being used to apply even more force to the area. Save yourself the trouble and go get longer screws.

Edit managed to get all the short screws in but honestly they should have not been that difficult to screw in. If the screws were just a few centimeters longer there wouldnt need to be any pushing or pulling against the plastic.