I'm having trouble getting the camera to loosen. I need to change the focus so I can attach an external wide angle lens to remove the blurriness. However, no amount of prodding seems to work. Has anyone done this and how did you do it?
I've done this a few times. You want to hold the (square) camera base to stop it twisting off the PCB, I use needle nose pliers. Then you could use forceps or a cut up credit card spanner to turn the lens. I didn't have much luck scraping out the glue, but a gentle twist would crack it then they move easily.
I quick search found this: http://www.thingiverse.com/thing:1574661 if you have a 3d printer.
If you use forceps have care not to scratch across the lens as they will probably slip before you break the glue. The credit card tool is described here: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=145815&start=200
Mine is about 20mm across so I can refocus them when they are sat in an enclosure but something bigger will give you more leverage for the glue breaking.