Hangar 9 Twin Otter ARF Assembly Manual page 18

Step 4
Use a drill motor and 9/64-inch drill bit to enlarge the
four mounting holes.
Step 5
From inside the nacelle, insert a 4-40 blind into each
of the mounting holes. Use a 4-40 screw, #4 washer
and 19mm standoff to draw each of the blind nuts into
place with a 3/32-inch hex wrench.
18
Step 6
Measure 5/8 inch from the right-hand side of the
firewall and mid-way between the upper and lower
mount holes. Make a mark with a felt-tipped pen.
Step 7
Use a tapered reamer to make a 1/2-inch hole through
the firewall at the marked location.
Step 8
Cut a hook and loop strap to a length of 8 inches
using scissors. Slide it through the aft set of slots in
the nacelle floor.
Step 9
Connect a 9-inch servo extension lead to the ESC and
secure it with dental floss.
Hint: Apply a very small drop of thin CA to the knot to
prevent it coming loose.
Twin Otter ARF Assembly Manual