My buddy is really testing my knowledge lol. He said three of the bottom corners of the 125 he's setting up have a gap big enough for three pieces of paper to slide underneath. He said it's just the corners, and as soon as he goes two inches from each corner, he can no longer slide even a single sheet underneath, which is obviously a good thing. I told him to just buy a pack of wood shims, but he is in the Bay Area and he can't go outside to buy a pack. It made me feel really spoiled lol, as I'm not in an area that's in a lock down. Anyways, I think it's a good question that I also want to know the answer to as well. Any advice and/or solutions?