for throwing, I use a five wheeled secretary chair that has a small springy back. I have a stiff wire coming forward from the frame that has a loop on it. I made a stiff wire hook on the front of my wheel frame.
When I'm centering and need to have my rear planted solidly, I hook the wire on my chair to the hook on the front of my wheel. At all other times, I unhook my chair from the wheel.
This allows me to to roll around short distances to grab tools etc. The flexible back of the secretary chair gives me support in a number of positions without restricting my movement.
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