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I have found two reasons for the furler not swiveling easily (other than bad bearings etc.)
1. As mentioned above - halyard wrap. This is caused by the tightness of the swivel and is like a catch-22. This is solved by fixing the root cause - hardness of the swivel.
2. Excessive tension on the jib halyard. The excessive tension tilts the swivel and makes it hard to swivel. If by loosening the hayyard slightly the furler swivels easier then that is the issue. The halyard need only be tightened till it brings a 'slight crease on the luff of the sail. Obviously this should be done when the sail is unfurled.
If both of the above fail to help, and the swivel is hard to turn even when there is no tension on it (such as when the sail is out) then it is a problem of the bearing inside the swivel. Refer to Profurl's instructions to un-jam/loosen the same or follow some of the suggestions provided above.
I would not use WD-40 as it is not dry and tends to attract dirt and manifest into other issues in the long term. I always use Team McLube's 'Sailcote dry lubrication' in place of WD-40 on any of my above deck rigging related lubrication requirements. You can get Sailcote at West Marine or most any marine chandlery.
Last edited by SeaFever2000; 06-03-2010 at 01:05 PM.