My son has occupational therapy and they have been using a one leg stool to help him with his self regulation. He has high functioning Autism. It seems to help him with his focus. He used to spend a bunch of time fidgeting while doing homework. Great tool.
Step 1: Materials
1. Thrift store pair of crutches $3 (kid size for this project)
2. 1/2" pipe flanges (2 since I did 2 stools. I figured I would never use the other crutch otherwise)
3. 1/2" pipe threaded both ends (cut in half for 2)
4. #12 wood screws (I bought 1" but should have got 3/4". I had to cut them down) or carriage bolts.
5. #8 self tap sheet metal screws. Or you can drill through and use a nut and bolt.
6. 3/4" birch plywood. This is the nice stuff used for making cabinets. Any piece of sturdy wood would probably work just fine.