Paxar TC6039OH Operator's Handbook Manual page 18

3. Pull back the supply lock tab.
4. Open the spring-loaded supply holder. Spread the supply holder tabs
apart with one hand so it adjusts to the size of your supply roll. You
can set it at 1.2", 1.5", and 2.0".
3-2 Operator's Handbook
Supply Lock Tab
Supply Holder