Casio CZ/ VZ/ FZ - Pro Series

I have a question about the replacement backlights: I have a backlight that was removed from an ASDA mp3 player - which gives a flat blue light suitable for replacing the missing one on the RZ1,although it is a tad shorter.
What I don't understand is where the light actually is on the original and how to insert the new one?
From the following instructions (which is a cheap way of replacement) it suggests the LCD has to have the reflective part removed from the back of the LCD glass in order that light pass through it. 
Since I already replaced some LCDs with modern backlighted ones,I have never needed to add a light,however upon trying the light I have behind one of the old LCDs,there is no light - suggesting that the instructions are correct,and that the LCD needs modifying before inserting a light behind it.
Having completely rendering a Casio VL1 display into oblivion by messing with the rubber strips that connect to the PCB I'd be loathe to mess with the RZ1 LCD (although I had it out already attempting to update it,only to find the single line displays won't work as the matrix is 8x2) in case I mess that up.

Does the LCD need messing with in this fashion to add a backlight,or am I missing something?

DIY LCD backlight - All
  
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DIY LCD backlight - All
 This simple method lets you make LCD backlight of any color and size to bring new look to an old device.  |   |

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      From: "Daniel Forró danforcz@yahoo.com [CZsynth]" <CZsynth@yahoogroups.com>
 To: CZsynth@yahoogroups.com 
 Sent: Sunday, 11 September 2016, 17:13
 Subject: Re: [CZsynth] CZ-1 Backlight gone
   
    Great! I'm glad I could help a little bit.
Daniel Forro

On Sep 12, 2016, at 12:28 AM, José Ángel Morente msxjam@... [CZsynth] wrote:



Hiya,

I finally replaced the CZ-1 backlight. It was quite easy and didn't take more than 10 minutes to do the whole job.
Thank you Daniel for your recommendation.
My CZ-1 looks like new now. :-)