Whilst sorting out the derailleur cables I noticed a couple of bosses underneath the downtube. The observant of you will have noticed it in in the picture in my previous post, for the less observant here it is:

Now I'm a bit stumped as to what they're for. The spacing looks about right for a bottle but that would be an insane place to mount a bottle. Some sort of cable-guide mounting also crossed my mind but if that were their purpose I think they would be mounted further up the tube. I guess they could also be used to mount a pump on but again I'm not sure that's what you'd use them for.
Until I find a use for them I've plugged the holes to stop muck getting in there by using some bottle-cage bolts that I had kicking around. All suggestions as to what the bosses are for greatfully received.
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