Great write up, It would be great in the Wiki.
I think you mentioned the 1/4 nuts a long tine ago and I have been running them since then on my 70cc build. On my 50 cc they are too light to fully variate so I an running carved weights that Nate of Motomatic built.
On my 50cc I am also running a secondary spring slid inside my stock spring so thats probably resisting the lighter weights.
I have yet to pull my rubber cusions yet. I,m wondering if I would notice any thing?
Any how great work.