When you’re playing a piece in G Major on a lute in G, you usually only need mis at the 1st fret. A good example of this would be “John Come Kiss Me Now” from the ML Lute Book. In such cases, to avoid having to use a tastino on the 4th and 5th courses you might want to slide your 1st fret down to the mi position, but it’s going to be too loose to be effective. I’ve found that if I tape the 1st fret into place on the back of the neck, it’s usually snug enough. I keep a length of scotch tape stuck to the back of the pegbox so that when I need the 1st fret only as a mi when I’m playing in a context in which there are no instances where I need a mi at a predominantly fa 1st fret, such as when you’re in G Minoir, it takes me just a second to tape it into place.