Step 231 uses 1/2" screws to connect the net to the field perimeter wall. However, there is no way for the screws to stay put. I have looked throughout the assembly manual to make sure I didn't miss anything. I have looked through the holes in the perimeter walls to confirm my thinking that there is nothing inside to attach to. Even poked a screwdriver all the way through. I'm wondering what the fix was? I can't find anything online yet. I want to maintain legality of the field for competition purposes.