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Thanks Seth.  I held the part .125" deep.  I initially used 60 ft/lbs of torque and literally crushed the part.  The second time I tried I tightened by hand with what I thought was very light pressure and only distorted the part slightly.  This part was initially designed to be round and made on a lathe.  I thought I was being smart by making it a hex and not needing soft jaws.  I think at this point I will try soft jaws.

 

The reason for not using the lathe was that I have no way to find the center of the part after turning it to allow me to drill the outer four holes.  Perhaps there is a trick for this.

 

Thanks as always for your thoughts.

 

Richard