How to indentified blade No.1 on A320 CFM-56 5B Engine

if you watch video already let me give you a few more informations about the front section of the engine.

Spinner Front Cone
The spinner front cone is made of composite material. Its design precludes the need for an engine nose anti-icing system. The front cone is bolted to the rear cone.

Spinner Rear Cone
The spinner rear cone is made of aluminum alloy. Its rear flange is bolted to the fan disk and is part of the fan blades retention system.
The outer rim of rear flange is provided with tapped holes for trim balance bolts. The front flange provides for attachment of the spinner front cone.

Fan Disk
The fan disk is a titanium alloy forging. Its inner rear flange provides attachment for the fan shaft and its outer rear flange is bolted to the booster rotor. The outer front flange provides attachment for the spinner rear cone. The disk outer rim has 36 recesses designed for fan blade retention.

Fan Blades
There are 36 titanium alloy, mid-span shrouded fan blades approximately 23 in. (0.58 m) long. Each of the blades has a dovetail base that engages in disk rim recess.
Blades are individually retained by a spacer that limits radial movement.
A retainer lug, machined at the rear end of each blade root, engages the forward flange of the booster spool and limits the forward and rearward axial movements.

Installation of the Fan Rotor Blades.
(a)
Position the fan blade No. 1 correctly (leading edge forward) and engage it (dovetail lug first) in the fan disk slot No. 1 immediately below the offset hole in the fan disk bolt flange.
(b)
Push the blade fully in position.
(c)
Pull down the fan blade to engage the lug into the booster spool recess.
(d)
Install the spacer (70) between the fan blade No. 1 and the disk. Push the spacer fully in position against the front flange of the booster spool.
(e)
Continue counterclockwise, forward looking aft and use the same procedure as for fan blade No. 1

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