Well that is what I am calling it. I am still getting used to this newfangled rear cassette thing. My other bikes are old.
Anyhow, I took off my rear cassette (cog?) to soak it as well as my chaing. As I was scrubbing it (it is an SRAM) I noticed I could spin the individual cogs around a threaded pin that basically held it all together. Well I spun the smallest one too many times and it came off. I managed to get it back together and then slid it back onto the hub.
But it got me to thinking. Does it really need that pin? If I took it out (and therefore had each cog and spacer loose) could I just put it back on the hub one at a time and then put the lockring on and be done with it? Having them loose would certainly make cleaning them easier. Of course I could see losing one of those spacers easier if it was all loose.