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My crown isn't loose but I think from the picture below we might deduce that it is either a scaleauto or MBSlot crown. These being the only two part crown set up I know of.
There are two threaded holes in the crown have you tried adding a second grub screw? Or even the same screw in the other hole?

There are two threaded holes in the crown have you tried adding a second grub screw? Or even the same screw in the other hole?