9
A threaded plastic cap surrounds the end of the PenFill
cartridge, like the cap on a bottle. In the center is the front
rubber stopper.
The rear rubber stopper is at the other end of the PenFill
cartridge.
SECTION 2 (cont.)
Insert the PenFill cartridge:
3
Hold the cartridge holder
so the wider opening
is up.
4
Drop the PenFill cartridge
into the cartridge holder,
plastic cap first.
2-3
