Ran this past my dad yesterday on a road trip. His reply was to use a wedge instead of a cam system. Similar to some jewlers vices. Such as in this link.
https://www.etsy.com/listing/2411844...aAimWEALw_wcB#
Spring force is always agents the wedge or cone limiting its reactionary force if the angle of wedge or cone is properly chosen. Just another RME ;-)
Eric

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