17. There are two screws holding the doctor blade in place.
The left screw is a normal thread screw. The right side uses a left-hand thread screw.
Be careful not to mix them up.
18. Vacuum out the remaining toner from the hopper from the slot next to the feed roller.
HP PRO M452 / MFP 477 (CF410/11/12/13 A/X-HP 410 SERIES) TONER CARTRIDGE REMANUFACTUIRNG INSTRUCTIONS
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