Timing Gear Drive
Oh, another thought. If CAT made the cam gear with the holes just a little bit more outboard, then you'd be able to assemble the unit loosely, do the newsprint thing and THEN tighten the bolts hopefully getting a much more accurate lash. The way it is now you have to loosely assemble, do the newsprint, then disassemble in order to tighten the bolts which could let things slip. Or if you could find allen head bolts that used a smaller wrench but I dunno if such a thing exists.