I created my rig and now I want to put him, for example, a helmet. I don't want to rerig all my figure with the helmet, I only want the helmet to be at the right position wherever the rigged head is.
How could I “glue” the head to the helmet?

thanks!

parent the helmet to a head bone

or use a rivet object

Thanks both!!!

I used Fetch to get the desired bone of the animation rig. After rotating and adjusting, it fit pertectly.