[JRTJH]

If the saucer wobbles on the mast and you are going to sell it (or even if you're going to keep it) why not just tighten the screws and run a bead of silicone sealant around the space between the saucer and the mast. When the silicone cures, the saucer won't wobble any more, and if by some chance, you need to disassemble it, you can always cut the silicone to get the parts separated.