Here is my solution, for whatever it is worth, to the jibsheet tangling on Mastendr. It is just a 3" PVC conduit strap from Lowe's with the ears cut off, and holes drilled for screws that use the same holes as the top of the sail guides (with longer screws, of course). I've had it for a handful of outings and it really seems to work, whereas before I often had tangling during tacking. I apologize for the ugly plastic bag I use to keep rain from going down the mast. Generally I keep her under a tarp, so that is unnecessary. But I had her home for a wax job, and it rained me out, so... and a baggie is just the perfect size, even stays on when towing.
(http://com-pacowners.com/gallery2/albums/userpics/10678/normal_DSCF0092.JPG)