1) Just saying "It's cyborg technology" deosn't really explain it. For example, does it... lenghten itself, but also get thinner? Or maybe it's actually a bit longer, but a part of it is in some kind of... space inside the handle... Wouldn't be that much longer.
2)He meant you should change the minutes in your post to how many posts it'd take for them to be able to move again.
3) That's just... a lame explanation. I know seastone works that way, but seastone is also canon. Moonmetal isn't, as far as I'm informed. And something (for example: a stone) from moon doesn't float on earth. The anti-gravity doesn't rub off on it.