Also to add, thee disc that came on the earlier kits had one hole in it. The newer kits have two holes and two indentation to drill two more holes to further tweak. But of course you can drill the earlier disc if need be. The hole size is approx 7/67th. And the disc is pretty soft metal, so a simple cordless drill would make short order of it.
The disc on the left is what I had, two holes and two indentations, and the one on the right is after I added two more holes.
After I get me ZZR shock installed I'll let you all know how it rides.
FYI, I installed the blue spring and went 3 turns on the preload also. I'm 220 lbs, so I split the difference between 2 turns preload and 4 turns preload.
Cheers
Ron