Dell B5460dn Mono Laser Printer User Manual page 22

Additional printer setup
8
Use the provided thumbscrew for the ISP to attach the plastic bracket to the ISP.
Note: Turn the screw clockwise, enough to hold the ISP in place, but do not tighten it yet.
9
Attach the two provided screws to secure the ISP mounting bracket to the controller board shield.
10
Tighten the thumbscrew that is attached to the ISP.
Warning—Potential Damage: Do not screw it on too tightly.
22