You can only pull it out from the bottom. You could just trickle thin oil down from the top. Something in the back of my minds tells me you're not supposed to grease / oil the speedo cable at all, but I haven't got the manual here at work to make sure I'm right. Best check that out first.
Another possibility is cable lube with the injector gadget, not sure how much of that would dribble out over time. A bit does come out of the low end of my clutch cable.
I get the impression from this forum that the most important lubrication point is the bend right behind the clock. That's where they seem to eventually break. I'm going to use aerosol grease (sprayed in with a straw like WD40) to lube that point.
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