Can someone please help me with a minor issue in Blender?

[deblueseven]

When I assign the BoS t51 decal to the bone "upperarm.L" or something of that sort, Blender gives me an error about unweighted vertices? I have already made the shoulderpads go along the upperarm skeleton rather than being static sticking out in the air, but the decal is now hovering in the air. Can someone please help me thorugh this minor issue? I feel like it isn't too complicated, hopefully...

[SirDuke]

I had a few similar problems before...

Some things I never got running well with blender.

 

So I just tricked them, using mesh rigger.

 

Used correctly, it will probably copy any weightpaint on any other object.

 

https://www.loverslab.com/topic/24797-mesh-rigger-skyrim-fallout-oblivion-beta89f-10-26-2014/