Re the BCG600 grinder - I have one too, have bought the part (don't know if it'll fit yet), and am in the process of trying to disassemble. Found a nice exploded diagram at
Got the front panel off - it looks to me like the silver grind adjustment ring has to come off in order to get inside, but hard to find where the clips are w/o damaging. I'll try spudgers made from old credit cards now ...
