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It tests how gullible an OMC owner is.
DO NOT TOUCH THAT SCREW.
CURIOSITY KILLED THE CAT.
no one's quite sure what it's for but there's a nut on the other side that will fall into the drive housing. If you slather some JB weld over it, you'll be doing a great service to anyone that may encounter it in the future.
I like to call it the OMC owner's 2nd mistake.