Sindoh M611 - Manual (Page 211)

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Maintenance and Troubleshoot
6 Pull out the new drum cartridge from its box, and then remove the protection cover.
7 Hold the handles of the toner cartridge, align the white tabs of the toner cartridge to the track
(arrow sticker) of the drum cartridge, and then push the toner cartridge into the drum cartridge.
The toner cartridge is properly installed into the drum cartridge when you hear a click.
Unpack the new drum cartridge.
Do not touch the drum. Do not touch the photoconductor under the drum cartridge.
8 Follow below steps.
A. Hold the handle with your palm facing upward.
B. Align the front hooks (arrow sticker) of the cartridge to the guides (arrow sticker) of the device.
C. Push the cartridge into the device until you hear a click.