What's the ceiling like under the spot? Drywall? You could try a stud finder but I'm not sure if you can get any that will read through stipple. If nothing else you can try the "tap tap thud" method. The empty spaces will have a deeper resonating sound, but will be a thinner thud sound where it's contacting the joists.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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