Originally Posted by
rcgod
If the collar is threaded onto the shock body how is it going to move when the springs compress? It would act like a preload collar and you would be using just the lower spring. I must not be understanding what you are talking about.
That's kind of the point of it. In the full size trucks we used this type of setup to achieve a softer rate near ride height and droop travel, which helped in rough track conditions. Then in cornering and jump landings the lower spring would act on its own to help with body roll and bottom out on jump landings. However, we also had position sensitive damping that was infinitely adjustable. Not the case in rc, so a dual spring setup doesn't appeal to me for this application. You can acheive a desired spring rate with a simgle spring. If you're never going to use the lower spring on its own at any point in the travel to get it firmer at some point, its useless IMO