Sorry for being late to the party but here's the write up from my retrofit a few years ago. Quad Retrofit
Hopefully there's some info in there to help with the whole process if you haven't finished yet (and yes, it's also a gratuitous opportunity to whore my pictures out again). To get the reflector out I just used a large screwdriver and wedged it behind for leverage. With some gentle yet forceful pressure it pops right out. I didn't apply any heat like REDCOMPG did but maybe that helps too. It gets easier to remove each time you install and remove it, I did it probably a dozen times during my project. Good luck!
