Mazzer mod no.3 - the sweep
To get to the part you attach the tape to, you need to disassemble the internals of the doser. It is quick and easy. Just undo the screw on the top of the dosing mechanism, then do the same for the adjustment nut below it and after this, you can just lift off dosing mechanism. The very bottom part remains in and can do so as the vanes on the top part that you have just lifted off overlap with those of the lower part that remains in the doser.
The picture on the right shows all the components that came out (all of them metal by the way). You do need to undo two more screws from the bottom of the "star" on the right of the pic to get all the parts off each other as pictured. This will make applying the tape easier.
Then the mod itself. I cut piece from the tape, it does not really matter how long a piece, but what I did is cut a relatively long one (about 12 cm). I then folded the tape over about a third of its width and then did the same again so that the sticky / adhesive side that remains exposed was about a third of the width of the tape (perhaps a bit more). Folding the tape twice makes the portion that will be doing the sweeping a bit thicker, less "bendy" and hopefully more durable. I then applied the tape to the vanes of the doser "star". Remember, I had cut an approximately 12 cm long piece and this meant that once I had covered one vane, I just cut the tape at the end of the vane and proceeded to the next vane (no need to stop, fold, fold etc and this way you will not end up with a tape that is too short).
I made sure that there was no adhesive part of the tape exposed (so as to not have coffee stick to it). Also, I wanted to have the tape extend a bit further along the vane and slightly onto the side of the centre section of the "star" in order for the vane to sweep the coffee into the dosing chamber instead of letting it end up under the centre section. The piece of tape that I had vut was long enough to cover three vanes, so I cut another piece of tape and repeated the above procedure to cover the remaining vanes.
I left around 5 mm of the double folded over tape extend over the bottom of the vane. Here's the star with the tapes attached and this effectively is the entire modification. Once you've done this, you just need to put the dosing mechanism back together and adjust the dose size smaller until the tape makes contact with the bottom of the doser. And there you are.
The small downside of the mod is that if you want to have a larger dose setting, you can naturally still adjust the doser to a larger dose but when you do, you take the sweep mod out of action because the upper part of the doser assembly will rise up along with the adjustment and the tape will no longer be in contact with the bottom of the doser. I do not consider this to be a problem because when you are grinding volumes where the doser actually becomes useful, the sweep mod is not a necessity anyway (in my opinion). The mod is useful for grind per shot (or two) use only. It is also worth noting that this mod can easily be undone - just rip off the strips of tape.
I have been working with this mod for a couple of days now and it seems to be holding up well. Also, the mod is effective and the doser sweep is clearly better as the picture to the right shows. The "before" sweep is on the left and "after" is on the right - there really are no grounds left in the doser after the mod.
One things that this picture does not show is the fact that some grounds do collect on top of the dosing mechanism (for the purposes of showing the effectiveness of sweep mod I had brushed them into the dosing chambers). This will the subject of one of the forthcoming mods...