Charles II or Charles John Amadeus (Carlo Giovanni Amedeo in Italian) b.1489-d.1496, was the Duke of Savoy from 1490 to 1496 but his mother Blanche of Montferrato[?] was the actual ruler as a regent.
... the upper rim of the groove, while the other end of the axis pushes against the lower rim of the groove. While the axis is slipping around inside the groove, the friction ...