Paper method. i put the 4 screws in the engine mounts but do not tighten. then i put a piece of paper between the spur and clutch with a little bit of forcei tighten the engine screws. Next i get a new piece of paper and run it back in there between the spur and clutch to double check the mesh. I look for any tears in the paper telling me its too tight but also look to make sure i see something.