SATO CL4NX Operator's Manual page 226

7 Appendix
5
Install the new platen roller. Make sure
that the first tab  on the driving end of
the platen roller is pointing upward. Then
push the platen roller in the direction
so that the first tab  is fixed in the
groove  at the driving side.
6
Next, make sure that the second tab 
on the driven end of the platen roller is
pointing upward. And then push the
platen roller again in the direction
that the second tab  is fixed in the
groove  at the driven side.
7
Turn the lever  back to lock the platen
roller.
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