Welding Skinned Mesh's to Character Limb

You can write your topic however you want, but you need to answer these questions:

  1. I want to take an accessory ( has upper and lower arm parts for r15 ) to weld to the character’s upper and lower arm

  2. i cant move the motor6d in the skinned mesh parts because if i remove them, they lose that property and every other way of connecting the parts to the arm, keeps them rigid, and don’t rotate with the arm when playing animations

  3. i tried looking around and tried using alignpos/alignorientation, weldconstraints etc