This is an idea that I started on in the late 90's. It uses 3 arms. They advance and retard their motion at an angle.
The plate they are on has its center elevated by a pin. There's a lot of trig in this. When the disc tilts it becomes
three dimensional. And then the arms rotate around an axis that is different than the axis that the disc rotates
around.
As for design drawings, I have used both CATIA and SketchUp. The design I am showing uses gravity to rotate a disc
essentially 90º to the directional flow of gravity. Basically the pin the disc rotates on and the arm on the same surface
creates a tangent used to calculate leverage. And then when the disc is leveraged it will rotate as well so it will be
moving 3 dimensionally in space. Anymore, I prefer simpler until I am healthy and have a shop.
The thread;
https://besslerwheel.com/forum/viewtopic.php?f=1&t=2180
This is basically what helped me to consider a 2 axis system of rotation for an upright wheel and then understood the grindstone
and drum that Bessler described.
And on an interesting note I was banned when I got cancer. I wasn't allowed to use that as an excuse not to do what I'm told.
When AB Hammer started a thread calling me the world's ultimate fraud, he even mentions that I used cancer as an excuse
not to do what I'm told.