You can always undo the grease nipple, put a washer underneath and retighten. This should change which way it faces.
When it's off you can also see if the ball on the head of the nipple is free by pushing it down slightly with a metal point.
I do mine about every 500 miles as its quick and easy to do. Remember if driving in wet etc conditions this can wash the grease away so will need doing more often.
