Next the plastic piece circled in red below needs to be unclipped.
Simply pull up at the three points circled in yellow where the plastic
piece snaps on the shaft.

The separation pad assembly is the same for the Laserjet
4000, 4050, and 4100. To remove simply take a small flat head screwdriver
and pop out the plastic arms circled below. This will free the separation
pad. Remove it and be careful not to loose the springs.

Insert the new separation pad, slide one of the black
disks all the way to the right, install the pickup roller, slide
the second black disc all the way back to the right, and follow
the reverse procedures to re-assemble everything.
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