The first edition M22s were heavier than the second edition because the amount of shielding on the motor structure was too much on the first edition. Shielding is accomplished by using a canceling magnet. If the canceling magnet is too heavy or too light the shielding will be reduced from optimum. The heavier canceling magnet actually made the first edition models less shielded than the second edition.

Ian Colquhoun
President & Chief Engineer