It is very light and happens 0.1-3 times per second. It seems to be coming from where the A-pillar meets the dash and only when the top is down and the car is moving. Music will easily drown it out but it is loud enough to heard over road/wind noise. It almost sounds like a very loud and very poorly timed pocket watch is lodged in the dash somewhere! 
Anyone else have this and figure out what it is?
Anyone else have this and figure out what it is?