Do you have a question about the Schlage Custom FC21 and is the answer not in the manual?
Attach the pin cap to the privacy pin to prepare it for installation into the lock mechanism.
Ensure the slot in the chassis is horizontal before proceeding with pin installation.
Insert the privacy pin firmly until it audibly clicks into place within the lock.
Rotate the installed privacy pin to the right until it reaches its stopping point.
Remove the pin cap after the privacy pin has been correctly installed and rotated.
Push the interior knob or lever firmly into place and then tighten the set screw.
With the door open, push the pin and try to rotate the exterior lever to ensure it's locked.
Use the emergency unlock tool to test the external unlocking mechanism.
Check if the privacy pin stays engaged after unlocking; if not, revisit step 1.