I was able to open my HD20SC housing after spending about 1.5 hours on it. I took so much time because I wasn't sure exactly where to apply pressure on the plastic tabs that hold it together. I should have taken photos of the process so others could do the job more easily. Sorry about that. But what I can say is that it can be done. As I recall, I had to use 2 flat-head screw drivers to slowly open the case, bit by bit.

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