They can be finicky. The adjustment plate is often called a snail due to the shape. Several have tack welded the HEAD of the axle bolt to the snail to aid it keeping it in one spot. Then you can use a wrench to adjust the tightness on that side. And on the other, as you tighten the nut, it is easier to keep that snail in place. I'll go look for the picture of the welded snail. It is strongly suggested that IF you use this tip, to ensure that the snail is completely flat against the head of the bolt. Clamp it in a vice before welding.