I never liked the paper method myself. I always get it as close as i can and tighten it up, and if its not right, I redo it. Normally doesent take but a couple minutes still.

 Make sure your engine mount plate is not bent too. They get bent from landing the truck on the engines head which bends the engine mount plate. When this happens, i have heard the spur gears go fast.

 I have no problems with my plastic spur, and i run my slipper all the way tight. If the mesh is right, the mount is good, and the bolts arent backing out, you should be able to make a plastic spur last a while.

 Eric