How are the OT's and UH's bolster held together?

[sfparamedic20]

Could anybody tell me how the bolsters on the USA OT's and UH's held together. I have never seen a pin through the bolster on these knives.

Thanks

d

 

[Upstream]

This past thread gives a fair discription of how the Swinden Key works.
http://www.bladeforums.com/forums/showpost.php?p=4499015&postcount=1