5c collet chuck

If you bought it new there should be a warranty for at least a year, no? I would call and explain you never used the chuck until you needed it and found this problem. That's what I'd try. Don't hurt.
 
I think you need a way to measure the bore, more then the face.
Who cares about the face, the collet doesn’t mount to the face, it goes in the bore with a taper.....the R/O in the taper is the big deal.....
 
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