Hallow Ball Joint

pinshape

This is a hollow ball joint designed originally to mimic a helping hands coolant tube. The durability isn't quite there for it to be used as a helping hand arm, at least not without some internal wire support. However, the joint can still be used in various other applications I think. If you need a loose joint that can be assembled by hand, I recommend opting for the loose tolerance version. Other versions require a little assistance either from a mallet or a heat gun to get the joint in initially. If you don't have access to a heat gun, you could likely use your printer's heat bed to warm the socket/base of the joint and then quickly insert the ball/head of the joining piece before the base cools down.