I am thinking of replacing my jib car with either Harken H452 or Ronstan 81942. The swivel feature looks attractive for single handed sailing by keeping the cleat in line with the skipper rather than pulling at an angle. Also, I thought the swivel fairlead might allow the jib sheet to release more freely. Does anyone have an opinion about which works better? On the Harken, does the fairlead swivel or just the cleat?