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I've put fan jets in a Super-Lite (single trim) brush.
Because the 'stock' of the brush is not as thick as a Vikan (or Unger), the jets protrude into the bristles by about 1/4 of an inch. However, there's NO way you could splay the bristles enough to cause the jet to contact the glass.
I only use the brush on downstairs windows and doors (I have my reasons!) but I think the fan jets are great.
I'll try and get a picture 'up' for tomorrow evening.
Mike