No, I didn't do it for now, but another guy in this forum or in technodrome forum did it and posted some pics, I haven't been able to find the post. Anyway it wasn't that difficult, he simply pulled out the head, just by force but you can choose to heat it up before, inside he found a plastic strip which keeps the eyeballs together. This strip is probably glued to the inner part of the head, the guy heated the strip up so to be able to unglue it, moved the eyeballs as he wanted, re-glued the strip back to the inner part of the head, heated up the head and put it back in place.