I'm learning about this stuff too. My spring ajuster was backed off to about .15 to .20 and also crossthreaded. I put it to .50" and drilled and tapped a bolt in the outer plate also. My belt deflection was 1.5 to 1.75, and I was seeing sluggish low rpm response and low track speed hill climbing. From what I've been able to tell people have been saying deflection should been 1". I added one thin washer to the ajuster to achive 1". I've started it up with the track off the ground, and it does want spin the track at idle with the brake off. On the ground it doesn't creep forward. I hope tomorrow to get out there and test it out.