| Dots what I do
I put the dots on my fingernails - that way I never miss!
Seriously, though, I can 'feel' the nodal points at the octave and in third position. Those are the harmonics you use to tune.
As I am shifting those points are just 'there' to remind me where I am. My teacher used to stop me in the middle of an exercise and make me compare my stopped notes to the nearest available harmonics - or an open string. He was developing my ear, of course, as well as my 'find the note' skills. Especially under the bow, though, those points along the string feel different.
I even find this helpful on those rare occasions when I play BG.
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Our Girl..... 
