This simple mod allows the slide to be mounted to most cell phones, turning them into digital spectrometers.
<img src="http://www.lamaredunet.fr/KitGsm/22022008128.jpg" alt="" />
<img src="http://www.lamaredunet.fr/KitGsm/1.jpg" alt="" />

<strong>Step 1 : Salvage springs from an old floppy disk</strong>
<img src="http://www.lamaredunet.fr/KitGsm/2.jpg" alt="" />
You need four floppy disk ( 3"1/2). 

<strong>Step 2 : Modify springs</strong>
<img src="http://www.lamaredunet.fr/KitGsm/4.jpg" alt="" />
With a pince, modify springs to get arms parallel. Do it for each spring

<strong>Step 3 : Use an old photo slide</strong>
<img src="http://www.lamaredunet.fr/KitGsm/5.jpg" alt="" />
Open it

<strong>Step 4 : Soldering springs</strong>
<img src="http://www.lamaredunet.fr/KitGsm/6.jpg" alt="" />
with a candle ( or something else ) turn springs very hot ( red ), and quickly solder it on the slide.

put glue on each spring ( and in all corners ).

<strong>Step 5 : put the second side on</strong>
<img src="http://www.lamaredunet.fr/KitGsm/7.jpg" alt="" />
close the slide with the other part. Press it for 3 seconds.

<strong>Step 6 : Rubber Band</strong>
<img src="http://www.lamaredunet.fr/KitGsm/8.jpg" alt="" />
take an old mouse pad and cut four parts ( 1cm x 4.5cm )

<strong>Step 7 : Glue rubber</strong>
<img src="http://www.lamaredunet.fr/KitGsm/9.jpg" alt="" />
put one rubber part under spring. put glue. put the second part on it and press hardly for 5 seconds.

do it again.

<strong>Step 8 : Finish !!!</strong>
<img src="http://www.lamaredunet.fr/KitGsm/10.jpg" alt="" />
Not really , just one more step

<strong>Step 9 : Diffraction grating slide</strong>
<img src="http://www.lamaredunet.fr/KitGsm/11.jpg" alt="" />
put a diffraction grating slide in front of it ( glue or other ).

Now you get a very cheap and wonderfull Pocket spectrometer useable on a lot of model of cellular and sone digital camera

<img src="http://www.lamaredunet.fr/KitGsm/12.jpg" alt="" />
<img src="http://www.lamaredunet.fr/KitGsm/13.jpg" alt="" />
<img src="http://www.lamaredunet.fr/KitGsm/14.jpg" alt="" />

a more complete how-to (in French but with a lot of picture)
<a href="http://www.lamaredunet.fr/KitGsm/KIT%20Reseau.pdf">Your text to link...</a>