3/8x11 into 5/16x14?

Yes. Just make sure the diameter of the shaft collar is close to or larger than the diameter of the butt collar.
 
They're all hollow behind the insert.
Ever build an 'i' shaft? How about an OB-1?
They're hollow all the way to the bottom of the ferrule.
The OBs now have foam in the hollow but there was a time when they didn't.
 
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