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The Taipan and the Magnum series Tantos have that spacer/bolster. I do not think it has any real purpose other than aesthetics
and maintaining the design length of the handle. If you go to http://hattoricollector.com and click on the Cold Steel Tantos on the left,
you can see them being made.
I believe the spacer there behind the guard keeps the guard tight.
The guard is a thin disk, and is press fit tightly, but there is not a lot of laterals support with out the metal spacer press fit behind it.
The Taipan and the Magnum series Tantos have that spacer/bolster. I do not think it has any real purpose other than aesthetics
and maintaining the design length of the handle. If you go to http://hattoricollector.com and click on the Cold Steel Tantos on the left,
you can see them being made.