CFraming welded parts?

Help and Feedback Scripting Support
#1

I am trying to CFrame two parts on the character to make fake arms but how do I CFrame and rotate without ruining the position?

I am currently doing this is there any better way?

LeftWeld.C0 = CFrame.new(0,0,0) * CFrame.new(0, 0, 0)
LeftWeld.C1 = CFrame.Angles(0,0,0) * CFrame.Angles(0 ,0, 0)
#2

why not use motor6d’s, https://developer.roblox.com/en-us/api-reference/class/Motor6D

#3

Can I get an example of what to do in my situation?