Cut a slot in the head and use a long screw driver.
Very elegant. reclusej
Early stocks actually had slotted screws NOT bolts!!
I have a dedicated thin wall socket, 12" extension and a ratchet, same as Peter...
A word of caution, Please be-careful the screwdriver or socket doesn't slip off. I have seen more then one butt stock ruined because the tool broke thru the side wall...
CW