Superglue. However, you wont, of course, need it. This is because you'll be creative and find a way to mount it and then create a bezel for it.
Be bold.
Bezel:
http://www.ebay.co.uk/itm/A4-Colour-Polypropylene-Plastic-Sheet-0-8-75mm-Binding-Art-Craft-Model-Making-/162105071097?var=461066200528&hash=item25be3715f9:m:mlAVZyLtosF0L5G7YUHLcQQ
Exacto knife. Hot glue. Superglue. Job done.