Resetting an odometer to zero miles

Hi everyone. This is a great site. I'm a long time reader, but first time poster....

Is it taboo to talk about odometer resetting? I can't find any existing threads on the topic. I would like to reset my odometer to 00000 in the course of my full restoration project.

I have the 150 mph speedo removed from the rally cluster on my 1970 340 Dart. I've removed the shaft with the number wheels attached. It's the next part I am unsure about. I can roll each of the wheels to "0", but there is also a thin washer with tabs located in between each number wheel. These washers do not rotate independant of the number wheels, and the tabs need to be in a particular location for reassembly.

Do I have to take off another snap ring and take all the parts off the shaft; I don't want to do this if I don't have to.

Can anyone enlighten me in this area. Also, during reassembly, where is the proper location of these tabs, as I'm not sure mine hadn't been messed with before I got to it; the numbers never seemed to be very centered in the window when viewed from the front. Pictures would be great if you've got 'em. THANKS!