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One problem is that, as best i can tell, the Atlas and Commando have different threads.  I tried to install a cNw version on a 72 Commando and it would not thread on, but it threaded on just fine on my 74.  The owner of the 750 told me the gearbox was from and Alas so I didn't look any deeper.  The 72's clutch nut would not screw onto me 850 which also implies different threads.  I could be all wet - I haven't research anymore than I just said!