I made this steering wheel extension so I could drive my TRX 4 with one hand and take photos or video with the other. I use my thumb to steer.
This was inspired by a similar design seen in a RC Sparks video.
The overall size is 84.46L x 54W x 19H
The wheel opening is 49mm.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/d1FprXL52za