do i just unscrew all the screws in the upper-arm? is there any post with pictures that can walk me through this? thanks!

Which Prime version?

leader class

Are you talking about the elbows so that the screws are on the inside?

If you are, I've done this. On both the regular and Premium versions, thankfully it's the same.

I recomend doing this in a fashion so that you don't lose pieces. Unscrew the shoulders and take the upper arms out carefully while holding the stuff face down so that things don't pop out and you lose them. Then assemble the shoulder so that when all is said and done, all you have to do is unscrew it and put the reassembled upper arm in and then close it up.

Things in the lower arm are easier to work with. There are no hinges and springs to worry about. So just swap the upper arm/elbows with the lower arms.

Then referring to what I said about the shoulders, reassemble and your done. I can't get any pics up until about mid week next week (on vacation).

Hopefully this was helpful.

it is helpful and many thanks!!

btw, have you done the swap on Leader megatron? i mean the black parts between the hip and lap.

Please to be explaining? What black parts? Pics?

Are you referring to the hip joints with the gold/brass strip (This is on the Premium version)? If yes, then no, I haven't done anything to Megatron. If, I'm not correct in what area you're talking about, please lmk.

yes, i do mean this part on the premium version. though i dont have the original movie leader megatron, i think this particular part is of the same color. if you compare both of them to the box-art on the back of their package, you ll find that this gold-stripped black parts are reverse. i've heard that if you swap these two parts, megatron will have a little bit more mobility for thigh.

Stands to reason that it would give him more thigh mobility. But the back of the box art on the back shows it assembled as it comes. But if you trie to switch them, it's probably the same routine since it's a ratcheted joint. Open it slowly so that springs and parts don't go flying when you open it.

I forgot to mention on Prime's lower arms, where they connect to the upper arms is a ratcheted joint, so open it carefully.

All you have to do with Leader Prime is unscrew the shoulders and upper arms (you do not need to mess with the ratchets in his elbows), take it apart, CAREFULLY open the part of his upper arms where the swivel joint is and rotate one half of the section to the side so that you can remove his lower arms without having to unscrew them as well. Swap the upper arms, rotate the half of section back over the swivel joint, again CAREFULLY, screw them back together, replace the arms into the shoulders (make sure that everything that came out of there is back in place first), and screw the shoulders back together! As for Megatron's legs, what do you mean? Are you saying that the screws are showing from the front? Slag you've got me intrigued...