Well, it's finished and it appears to work well! The car still skips a little on the turns but that might be due to it fighting for grip. I do however notice less hopping and faster turns. With this set up, I can just barely adjust the damping effect by changing the spring out. I'm useing the springs from my Lit for this car. Now, I need to make another disc-damper for my Murcielago if I can figure out why it's quitting on me.
For the disc's, I'm useing a pair of washers that's inner diameter is the same as the screw.
I hope you can see it in this photo, but there is the yellow spring inside sandwhiched between the top deck and lower deck.
I have yet to try this one with the X-speed motor, but so far I can go full throttle around the turns.