It's a shame the seller didn't know how to properly pack a skimmer. I'd send it back or ask for a refund. If he's reputable, he will make good on it. If not, file a paypal or credit card dispute. I'd be skeptical that glue will hold that together well given the pressure on the neck seal. Since that piece is likely CNC'd, you would be hard pressed to get a new one made. You might contact JNS and see what a new body will cost but I suspect it will be more cost than it's worth. Heck, maybe they would sell you the neck piece and you could have an acrylics shop cut the old one off and glue the new one in place.