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Mrs kumkuat has this book on "do it yourself brain surgery", she came at me with a black and decker with a 7/16th bit. stupid biatch should have known a 5.5mm would suffice. whats the recommended drill size for trepanning. she swears her sex drive will open up with a hole in my head.

Nah not the 7/16th or the 5.5mm go for the 1/2 inch or 13 mm for best results, the bigger the better