I would file a complaint with the seller. I bought a Pastushin DC-3 that was propped on its ball for pictures. I chaistised the seller and got 2/3's money back (they were a large seller on Ebay and dis not want the negative feedback) I always ask that the Allyn ashtray be disassembled before being shipped. I just wrote a guide on packing these models for EBay that addresses the issue.
That said, your mechanical option is to carefully drill both both ends and imbed a small shank of music wire at least 1/4" long. I usually oversize the hole on one side by one size up so that the ball may better fit the break. Then re-epoxy the assembly. Send me some pictures to
www.parkreation@msn.com and let see what you have.
Tom Sanders