Theres a couple things you can do. I just got my elder a week ago
. First, you can try a blow-dryer to make the neck softer, or, what I did (because the blowdry technique can cause meltage on dreads) take some tweezers or somthin and look inside the neck (the part attatched to the head) theres like a hard-rubber ring inside the rim. Pull it out (kinda hard) then you can get it on the body-neck pretty easy. Then stick the head back on to that. Use a bit of super glue to make sure it stays there though. Thats what I did. (but make sure the glue is only on the ring-inside of the head, so you don't accidentaly glue it to where you cant move his head anymore. ) If you need more help let me know bro
OH, fyi, brute force can result in the spliting of your pred-head. Trust me
Also, you can try to put some lotion or somthing in there to lube it up. Slide into place easyer.