I'm not sure where to begin. I have a left hand disability, and can't really "grab" a steering/spinner/suicide/brodie knob without also using my forearm to hold the steering wheel of my tractor. It's frustrating not being able to operate the steering smoothly. I've looked into steering aid devices for handicapped, and there's nothing suitable to fit my situation. I'm sure something could be made up if I went into a place where my hand/wrist could be measured, but I'm also sure the cost of it all would be very expensive.
Here's the idea in my head.
The steering knob I'm wanting would have a (lets say) large single ball bearing (stainless?) as the post. My hand (with a wrist brace?) would have either a metal (something like UHMW would be better) socket, or "cup" that sits over the "ball" on the post. Just loose enough in tolerance that the ball and socket are not sloppy. In many ways similar, like the way a replacement hip joint is designed to function.
I'm wondering if there are members here that have design experience in creating something like what I need. CAD perhaps, is a thought. Just flowing thoughts off my tongue, if the right person hones in on my idea, they too will pick up on the concept I'm wanting have as a steering device. Maybe that someone could make something for me. I would gladly pay for a solid design that would help me operate my tractor controls efficiently.
Thanks for your time.