I struggled a lot with halyard wraps on my Facnor furler, while it had the deflector. Turns out these deflectors are actually made to prevent spinnaker halyards being caught in the head sail wen it gets furled. Installed a halyard restrainers after years of misery, problem solved. Lost the restrainer this year (pulled out of the mast),.... and immediately a major wrap issue notwithstanding the deflector that's still there. My neighbour has the same furler and exactly the same expirience. 
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