One other note. You MAY need to notch the inside of the plasitc covers to insure you don't cut or nick the emitter pigtail you're about to glue inside.
I found this out the hard way, and it took me forever to figure it out (naturally, the most obvious thing was the last I suspected!)
avdude
AVDUDE "It might work better if it were plugged in and programmed first...just a thought!"