question about mainshaft

As in my previous post ,why is there a difference in mainshaft ? This one has a hole in the inside , the other one I am installing does not, why the the difference?
Stan
9N 222933
2N with 8N motor 8N345567
8N 146710
8N 179555
8N 197904
8N 199000
8N 254079
8N 362039
 
Sorry missed the picture. try again.
a105059.jpg
 
Just a NSWAG but I'd say the hole is due to a requirement of the manufacturing process likely used to rotate the shaft as it is milled.

Henry used different vendors - Each having the potential for slight variation in appearance but meeting design specification.
 

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