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if you're unsure of tight or loose, then I recommend the correct, if tedious, method. Tighten until it's snug/stops turning (turn clockwise looking down on it), then back off (counter-clockwise) three full turns.
the large nut is fitted by a 17mm box end wrench. the adjuster is fitted by a 7mm open end wrench (it has a square top - which will come in handy to count the turns to add up to 3 full ones).
The big nut only has to be loosened, about an eighth turn. It then stays over the nut, resting on the differential cover, to keep it from turning anymore. Then, I can only manage about a quarter turn with the 7mm wrench, and it's all done by feel - can't see the little bugger - it helps to take off the vent hose near the dogbone (mount behind engine) - also I recommend removing the negative battery post to prevent sparks if you touch the starter post with a wrench.
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