Tractor Spinner Knob

Our family John Deere tractor has been cutting grass and plowing snow since 1996. Since you control the throttle with your right hand, steering falls to your left hand, and if you can't do both at the same, you're gonna have problems. Even with power steering, this was a huge ask for middle school me... so I took a skateboard wheel and some threaded rod, and made a spinner knob to fix it! Over a decade later and it's still working great.