Datamax H-4212X Operator's Manual page 31

F. Align the Tabs on the Rewind Core Adapter to the Slots in the hub, and then slide the
Rewind Core Adapter onto the middle of the hub.
G. Grasp the end of the hub and, while pulling outward, squeeze the hub together until it
collapses then slide Rewind Core Adapter toward the Centerplate until it locks in place.
H-Class 21