I've got a shimmy that was there with my old hard Maule tail wheel. Just replaced with the 8" wide matco single arm and it's a major improvement. Still shimmies though. I've got the dampening springs and the chains aren't tight or loose. I think it's caused by the spring flattening out.
I'm running two leaves and want to get them re-arched the same.

How would a guy re-arch the springs?