A load of balls, or Damn, it's a nice sunny day --

--- and I wont be going out. The cold that I thought was getting better got worse and I felt really rough till midday so it's another indoor blip.
A couple of days ago I blipped my broken wind gauge, this ball race was the culprit. Even with a strong magnifier I can't find anything wrong, I can only assume that a tiny piece of grit had got in, it wouldn't need to be very big as those ball bearings are only 1.5 mm diameter.