Constantly moving their joints will make those connection loose. If you are working on things like stop-motion videos where you are frequently adjusting the joints, it is best to use cheap minifigures. You can still play with more valuable minifigures, but it is best not to constantly move their arm around.
Do Lego Minifigures come apart?
No, they are not meant to come off (and neither are their hands) and I imagine that doing so repeatedly will cause them to become loose, as is the case with hands.
How do you loosen a Lego joint?
Take a VERY tiny drop of crazy glue and put it inside the joint, and let it dry overnight. This will cause the joint to be come ever so slightly smaller, and it will make the joint nice and tight. It is inside the joint, so it is completely invisible, and if needed it could be done repeatedly.
How do I fix my Lego hand?
To fix what you already have, the best solution is to insert a very small amount of superglue inside the arm socket and then stick a hand in, turn it back and forth for 5 seconds and pull it out. Wait for it to dry and you’ll have some friction back.
Why are Legos so expensive now?
High-Quality Material. LEGO is made from thermoplastic, which is known for its strength and durability. The specific plastic, acrylonitrile butadiene styrene, is a petroleum product. It means the raw material pricing is related to the price increase or decrease of crude oil.