hey, i got a laser online, it has an adjustment piece which is basically a big lens holder,
http://s7.postimg.org/wgb1j3gij/laser2.jpg
this piece is what i mean.
and inside that piece their is a lens like this
http://s16.postimg.org/nfkfmgfat/lens.jpg
except its an acrylic lens with a brass...