Need suggestions for things to "look at" on my furler. It is a Furlex unit and believe it to be original to the boat. The sail is difficult to furl and unfurl. The top swivel car and bottom swivel cars both rotate freely, yet it takes major effort to unfurl. One characteristic that might help explain what I'm experiencing......if I go forward and physically grab and rotate the furler drum to deploy the sail, the first 90 degrees of rotation is difficult, a lot of resistance. The last 270 degrees spin pretty easy. Almost feels like there is a "hump" I'm trying to get over. Any suggestions of what to look at?