In a message dated 5/16/2010 7:05:11 A.M. Eastern Daylight Time,  
[email protected] writes:

The  smaller diameter end was indented 
to allow for the needle bearing guard on  the endgate. 


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I assume the (original) purpose of the mandrel's "overhang" was  to prevent 
the wax shavings from falling and jamming up the pivot  point.
 
Allen
 
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