For anyone interested from the ASTROLUX MF04 GB, there are 21 pcs available of the A037 Aspheric condenser Lenses at
http://www.optolife.com/singlet_lens/A037.html
you can see the mod in progress by Kenjii post 213 here BLF GT (preliminary) modding thread
Of course you will need to mod your flashlight to make it fit.