Help with joint rotation when flipping a game object

Hey everyone. I'm putting together a full VR body game. The full body mesh's hand joints postion and rotation line up with joints from a hand only rig. The transforms are correct with the left hand. As soon as I scale the right hand in the -x axis, like mirroring the same hand rig, they get messed up. Here's some code that I'm using:
BodyRightThumb1.localRotation = ColliderRightThumb1.localRotation;

How would I fix this? I'm not a programmer, so if you could provide the code here I'll give it a go.

Thanks!