Another thing worthy of noting. In arm mode, the individual bot's knee joint acts as the proper elbow joint, and they're pinned and quite sturdy. However, the thigh ball joints can be used for additional movement as well, and I feel they will over time become weaker if you display the arm in a raised position , as the ball joints will need to hold the weight of the entire lower arm. So do be careful with these. And when twisting the bicep swivel (individual bot's waist swivel), try to grab the waist piece rather then the thigh pieces, as the ball sockets allow for some limited horizontal rotation. So keep doing this will weaken the ball joints as well.