Well Wheeze, you had me looking at GG Grinders, impressive. I do not get into catching keif or storing ground weed and have never owned a 4 piece grinder but that led me to seeing Phoenician Engineering's grinder made in Phoenix, AZ. Found on Amazon is a 3.5" 2 piece model that caught my eye. a little bigger than my 2 piece mendo mulcher. seems it might be easier to hold onto for the initial 'twist' to get it started when grinding a full load. will be a Christmas present from my girl. and thanks to you too couchlock. good thread.
so I (actually my wife for xmas) bought the Phoenician 2 piece. Outside diameter 3.25 inches, 1 inch total depth, it has 12 oval shaped teeth. Put a bud in and it isn't the easiest to rotate. Fewer teeth in a much bigger (than the mendo mulcher) case makes for some tough turning. the mendo mulcher is 1.75 inches in diameter and has 15 diamond shaped teeth. ground bud from the Phoenician produces much larger grindings then the MM.
I find myself using the smaller mendo mulcher.