My son has wanted this forever. We picked it up yesterday and assembled it. I've been a model car builder all my life so it was a breeze. It is pretty straight forward, however the finger tendons are quite stiff. The gold finger inlays are hard to snap into place as well. A small pair of pliers with a cloth over the jaws made it quite simple. Once we got that out of the way we ran into an operation problem that most on here has mentioned. The fist would not close.
I followed the instructions very closely and they fail to mention a vital point. First go ahead and install both levers from the get go. This will come into play later. When inserting the actual arm into the spring loaded canister MAKE SURE you are holding down the gold rod, that attaches to the hand, with your thumb. While FIRMLY holding the rod down, line up the arrows and PRESS DOWN HARD while twisting. This will ensure that the rod is firmly seated in the mechanism that the handle operates. It is designed to compress together then expand and catch the inner lips of the cylinder. You can test whether you have done it correctly by holding the gold rod and turning the left handle back. You will not be able to hold the rod back when pulling the lever. Hence installing the levers first. On the other end when you attach the hand at the wrist, don't pull the gold rod up to place in the hole on the tendon unit. Simply pull the tendon unit down and the gold rod will fall in place. Once in the hole give it a firm push to ensure it is seated. Problem solved.
If you have assembled a non working unit. It is possible to take it back apart. The hand is fairly easy as one fastener sits in a straight groove along the palm. Push up slightly and you will see it raise up. Gently pop it out, disconnect the rod and raise the hand back up opposite of assembly. The shaft (arm) is tricky but can be done without ANY damage. Get a firm grip at the bottom and push down and gently turn. The plastic will begin to separate along the seams but very gently yet forcefully (oxymoron I know) twist it back and forth. It will pop out. Once done simply follow the directions above.
Another problem is the ropes that the levers pull. The one on the right, that twists the arm, must lay across a silver pin. If you extend the arm and look at the base you will see both the string and pin. I used needle nosed pliers to lay it back across the pin. This takes up the slack in the string and ensures the unit functions properly.
With better instructions or following these I have mentioned, this item is a blast to build. I would recommend to anyone using the information I have shared. This item is NOT JUNK.