Thanks Jon. Yes, I was looking at the wrong instruction sheet. However, the cart described in the correct instructions has slight, but significant differences from the one I purchased, which confuses me. The chip is on the top, but located on the opposing edge from the one pictured in the instructions. Secondly, the fill hole is on the rear vertical edge rather than top as shown in the instructions. I have a couple of snapshots of the one I have, though I see no way to attach them here. Shall I send them by email?