Hmm, strange- I have a
Brinsea Mini Advance as well- and little cog-wheel turner worked for me- does the weel still turn, but the eggs don't?
Make sure the eggs are placed in the little egg-shaped cutouts, with their shells directly touching the plastic- then check the intervals that the turner is set to- if the intervals are too short, maybe they are turning, but you don't notice?
If the turning does not work, you may have to hand-turn the eggs. This requires making a visible pencil mark on each egg, like an X or an O, then twice, or sometimes three times a day, you switch the side that the X is on. So, every morning, turn the eggs so the X is downward. Then at noon, turn the X back upward, then at night, turn the X downward, and continue on from there.
I understand you want an awesome hatch rate with those Legbars!