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http://www.wiggle.co.uk/shimano-ultegra-6770-di2-cable-cover-sheath-for-sd50/
Heat shrink should state the starting and shrunk diameters. Don't go too small. 5mm presumably will be fine. Or just use spiral wrap
argh, my eyes!
Heat shrink or a cable tidy, plus a stick on Di2 channel would be neatest, I'd imagine