Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3291811. This adapter allow you to drive an RC car one-handed, use your index finger for throttle like usual, steer with your thumb. Great for driving between obstacles on a crawler trail or when you're also trying to film while driving. The inner diamater is 51mm/2inches, I designed this for a Spektrum DX5C radio but it will fit a lot of other radios, especially if it has a wheel that stick far outside the main body. The clamp diameter will easily flex to 5mm larger or smaller when printed in PLA, 20% infill. There is a groove to strap it on with a ziptie. Printing a scaled version could help to make it fit other radios. Demonstration video: https://www.youtube.com/watch?v=KRL_PJjuW-M