IBM 1800409-001A - Manual (Page 214)

CAUTION: If you are replacing the pressure-release pieces after
the printer has been running, make sure the fuser unit has cooled.
The fuser gets very hot and can damage these pieces.
5. If you are replacing the pressure-release pieces, hold one of
the pieces down close to its base and firmly slide the base
between the fuser rollers on one end (fig. 6.9). Then, repeat
the process with the second pressure-release piece at the other
end of the fuser rollers. When correctly positioned, the pieces
fit snugly between the rollers.
6. Close the pressure-release lever on the end of the fuser unit.
7. Close the separator pawl unit.
8. Close the paper exit unit.
Fig. 6.9 Replace the Pressure-Release Pieces
Chapter 6
6 - 2 4 C o n s u m a b l e s a n d P r e v e n t a t i v e M a i n t e n a n c e