orc with detachable arms

I am currently painting some 40 orc warriors in batches of 6. I figured it would be a good idea to make the arms detachable by fixing a magnet in each arm. These pictures show the prototype.
It can be equiped with 1 handweapon, with or without shield, spear or 2 hand weapons. Although I have to paint twice as many arms, I don't have to paint double (or tripple) the amount of orcs. It also makes aligning them up easier as you can move the arms.