This is the arm that I am using. As you can see there is no armatures to animate the arms, but there are vertex groups. I didn't animate this, this is exported from a game.
The idea I had in mind was to put them together and parent each other with automatic weights.(I got this from this tutorial: https://youtu.be/FiaXBDsk4M0?t=193)
I have been having trouble for a LONG while and it led me here trying to get some help.
I need the rectangular prism to be stiff(not warped) and follow the transformations of one of the arms. Anyone have an idea to do this?