I borrowed this idea heavily from grglover's tool hook. I found that when I took the tool off, the hook would come off with it. So I did a complete redesign with new measurements. I made the top of the tool holder rounded to match the hole in the scraper. And I added a little notch that would lock the tool in place, so when I removed the tool, the holder would stay in place. And finally, I added a little lip at the end so the tool wouldn't slide off accidentally.