If you are not planning on taking the front cover off I would plan on doing it. The jig method does not address the 5 10MM bolts that hold the front case to the engine inside that cover. I've seen the results of one of these bolts coming out - cam broken in three places, 6 bent push rods and lifter damage. If you take the cover off you can remove 4 bolts clean and loctite them. The 5th needs a 10MM wrench bent to get to it. It sets behind the PS/Vac pump drive gear. You can loosen it up, clean it, loctite it and tighten it back up again.
Bob