old thread but good-un...
I just used this to mod my Macap M4 (or MC4 or whatever):
To remove the doser, remove the 2 screws holding the clear plastic cylinder on, then turn it over, remove the 3 little screws holding the bottom plate on, and you will see a 5mm allen/hex bolt staring up at you - remove it and the doser falls off.
BUT, you cannot use the 2 screws that held the thick plastic cylinder on to hold the thin bottle on as they are too long - I found that a couple of computer case knobbed bolts did the trick.
I chose to use a 1 liter bottle which makes it a tad dicey turning the knobbed bolts to hold it on, but it went well, and with a little pushing, matched the curvature of the opening.
Grinding was a snap!
I only do single doses (18g or so) at a time, so I also got rid of the hopper and am using the Macap "tamper" as a weight on top.
Again, thanks! (next month, worm drive!!!)