Shimano GRX RX 815 Series Dealer's Manual page 60

INSTALLATION/REMOVAL
Installing junction [A]
6.
Attach the end cap and handle holder to the bar end on the opposite
side.
(1) Insert the end cap into the bar end without junction [A] installed.
(2) Refer to Step 4 to attach the handle holder.
(1)
End cap
7.
Temporarily secure the dummy wires to the handlebar as necessary.
Route and temporarily secure the dummy wires in the same manner as the electric wires.
TECH TIPS
Dummy wires
• Dummy wires are attached to give the handlebar end not fitted with junction [A]
the same thickness of the electric wires so that the rider does not feel the
difference between the left and right handlebar grips. Route and temporarily
secure the dummy wires in the same manner as the electric wires.
Handlebar
Tape
Dummy wires
60
(2)
End cap
Handle holder