020 ObeliskThe obelisk was the first construction to really give me trouble. Remember, this set is a new/old stock, and I was the first person to open it. I did a careful inventory of the parts, and based on the instruction sheet, I'm confident there are no missing pieces.
So I was quite surprised to find I was one piece short when I was building this. If you look very carefully, you'll see that the two pieces on either side of the big piece don't quite line up. That's because I really needed one more three-hole piece (like the one on the top) to use for the base.
The instructions clearly show that side piece resting on a small piece, and the four-hole part standing in the front. That left the two three-hole pieces, one of which had to be placed on top. So I balanced the big piece on the remaining three-hole piece, and just let the side piece rest on the surface rather than a metal piece.