[davewaldo]

It is quite sturdy, it does sway a little if you move around but it doesn't slip because the wheels lift off the ground when you sit. If you sit still it is most secure and sturdy.

Best of all it only cost me $7 for the hooks and nuts & Bolts. I had the other materials lying around the place. I supose if you had to buy all the materials it might cost around $40 to make.

The reason I liked the idea so much is that I already take the trolley everywhere with my dob, so to take a small chair attachment is easier than taking a whole chair!

Dave.