How to move and rotate motor6D's C1 effectively with arc handles and handles

Hello! I am making a pose editing system like one in the hit game catalog avatar creator.

I use arc handles and handles and move and rotate cframe1 of the motor6D of each body part cuz the players will die if I move their parts.

But the problem is my current way sucks. I can’t find a good way cuz theres little info about handles and arc handles in this forum

So do you have any good ways to change motor6D’s C1 property with arc handles and handles? Thank you.