[pistol]

Is this what you think the magic of the right forearm is.

Bending + fanning = right forearm takeaway

So, what are the correct muscles, bones and joints used to perform it?

The right shoulder joint and the muscles involved to move the upper arm have a key role in the magic of the right forearm.

The fanning motion you are talking about is from the rotator cuff muscles in the right shoulder rotating the upper arm

When you learn how the body moves you will understand.

The hands/arms work on a vertical circle while the rotator cuff controls the right shoulder motion which also works in a circular motion which is anticlockwise kinda like over the top motion