What was the difference between the Kim and Sutro lever for the M lock?

The old Falcon M lock had 2 lever styles that were very similar in appearance; the Kim and Sutro.
 
The Kim lever was hollow with a plug on the end of the lever while the Sutro was solid (aluminum filled).  Both levers were dimensionally the same but it was decided to only offer the Sutro lever on the MA.  See detailed lever differences here.

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