Another Approach to Rossi Adjustment Modification
I don't know if it's proper protocol to add to this thread or start another. If it should be another thread, please, moderator, create one for me.
Anyhow, I used a different approach to accomplish the same thing. Mine isn't better, but given that I don't have a mill or a cnc machine, just a ye olde lathe, it was much easier for me. I removed the spring loaded pin and rather than using that pin socket as an "anchor", I used an approx 1/2" hole that is located to the right of the center of the grinder. This hole is covered with a plastic cover and I have no idea why it is there, but it works well as an anchor.
All I did was turn a tenon (off center using a 4-jaw chuck) to fit into the hole (no attachment) and drill a hole to take a stainless steel allen head screw of the correct size. While I was at it, I replaced the other two screws which were getting a bit rusty. Then I made a knurled handle which I pinned onto a 1/4" SS threaded rod. The rod fits into a brake shoe made of a piece of hockey puck (this isn't pictured). Anything including an eraser would probably work.
I've been using the mod for 6 months and it works well; no slippage, instant continuous adjustment and it dampened the vibrations resulting in a quieter (still too noisy) grinder. I use the existing scale since there was no reason to change it.
If you look at the pictures you'll see another mod as well. I removed the grubby hopper and put in a purple plastic tube of the correct diameter. It has two o-ring slots let into it-- one pictured and one at the bottom of the tube which locks it into the grinder. This works well (with the tamper made from a piece of firewood).
A couple final notes: I clean the grinder if it hasn't been used for half an hour. First I use that rocket shaped air blower (see pic) that is available from photography suppliers. It works much
better than CO2 or other compressed air. The blast has lower velocity but higher volume and when blasted into the square hole while the grinder is on, it does a very good job of getting rid of excess old coffee. Then I take that large paint brush and brush the doser as I flip the handle, removing most of the residual coffee.
I should mention, that I admire the original poster's solution; it probably is better or at least prettier than mine. But the grinder itself is pretty ugly, so maybe mine is in the same spirit.
UPDATE: I sold my Rossi, having gone to hand grinders, but I thought I'd offer the following for anyone who wants to make their Rossi step-less without having to do anything much:
1. Take the burr assemble apart and remove the pin (and spring) that pops up and goes into the holes in the numbered black plastic ring. Now you have a step-less grinder. The problem is that the ring will turn while the grinder is grinding.
2. Get a pen with a rubberized grip that will serve as a wedge between the above plastic ring and the grinder body. This wedge will keep the ring from moving. I used a pen for quite awhile. A rubber eraser trimmed to the shape of a wedge and wedged in that spot would work just fine. I used a piece of hockey puck as a wedge and it worked fine as well. Keep the pin and spring and if you want to get rid of the grinder you can return it to stock.