Hangar 9 P-51D 1.50 ARF Assembly Manual page 12

Section 2: Aileron and Flap Servo Installation
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. . . .Step 3
Locate.the.servo.mounting.blocks..Use.6-minute.epoxy.to.
glue.them.in.place.on.the.marks.made.on.the.hatch..Allow.
the.epoxy.to.fully.cure.before.proceeding.to.the.next.step.
   
. . . .Step 4
Place.the.servo.between.the.mounting.blocks.and.use.
a.felt-tipped.pen.to.mark.the.location.of.the.four.servo.
mounting.screws..Note.that.the.servo.must.not.touch.the.
hatch.in.order.to.isolate.engine.vibration.
Note:.Before.mounting.the.servo,.it.is.
suggested.to.electronically.center.the.
servo.using.the.transmitter,.then.install.the.
servo.arm.to.avoid.having.to.remove.the.
servo.and.center.the.arm.later..It.may.be.
necessary.to.slightly.trim.one.of.the.servo.
mounting.blocks.to.clear.the.servo.lead.
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. . . .Step 5
Remove.the.servo.and.use.a.1/16".drill.bit.to.pre-drill.
the.holes.for.the.servo.mounting.screws.marked.in.the.
previous.step..Use.the.screws.supplied.with.the.servo.
to.mount.it.to.the.servo.mounting.blocks..Remove.the.
portion.of.the.arm.not.extending.out.of.the.hatch.if.you.
have.not.done.so.
   
. . . .Step 6
Use.a.piece.of.string.with.a.small.weight.(such.as.a.wheel.
collar).attached.as.a.device.to.pull.the.servo.lead.through.
the.wing..Lower.the.weight.through.the.opening.at.the.root.
of.the.wing.as.shown..Stand.the.wing.on.the.tip.and.allow.
the.weight.to.drop.through.the.wing.until.it.appears.in.the.
opening.for.the.servo.