Star LC-4511 Instruction Manual page 15

Installing the ribbon cassette 7
Rotate the knob on the ribbon cassette clockwise to take up any slack in the
ribbon.
Tension knob
By hand, move the cartridge holder to the left side where there is a cut-out
in the top guide to allow easy installation and removal of the ribbon
cassette.
Carefully place the cassette onto the cartridge holder making sure that the
spindle of the holder fits into the socket on the bottom of the cassette. Also
make sure that the side tabs fit into the grooves on the sides of the cartridge
holder.
Ribbon cassette
Cut-out