Shorten a Novatac 17670 body for 17500 battery?

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Can anyone here shorten a Novatac 17670 body and rethread the end so that a 17500 battery could be used? Does anyone see any potential problems with this?

 

[John_Galt]

Why not use a spacer?

 

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I am interested in more battery capacity than a CR123 but a shorter length than a 17670 battery would require. Plus, it's something different.

 

[flip]

Nobody? Oh well. It seems to be working fine with an 18650.