Well, I'm giving Wemoto's 'Slinky guide' cables a go. Still can't get over the name, but I'll report back as to whether they're any good. Wemoto have a pretty good reputation, so I'm hopeful. Chap on the phone said that Wemoto are getting them made to spec and I hear they contact the manufacturers of OEM products for this kind of thing, so fingers crossed, they might even be made by the same company as made the Yamaha cables.