Shimano Nexus Inter-8 Dealer's Manual page 23

3.
Wipe away any grease which may be on the inner cable,
and then pass the inner cable through the rubber bellows.
After this, insert the outer casing into the rubber cover and
set it into the outer casing holder.
1) While holding the end of the rubber bellows, insert the
inner cable. Be careful not to pierce the rubber bellows
with the end of the inner cable at this time.
2) Slide the rubber bellows onto the inner cable.
3) Push the outer casing on so that it securely touches the
outer casing holder.
Use a new inner cable. Do not use a cable which has
had the end cut off.
Be careful of the inner cable end
OK
End of rubber bellows
Inner cable
Rubber bellows
23
Not OK Not OK
Inner cable
Rubber bellows
Outer casing holder
Outer casing
Rubber cover