I would like to thank everyone who has taken the time to reply.
I have been using these threads that I found doing a Google search for "how to" setup the "Side Slider Switch" as the aux button;
http://www.therpf.com/showthread.php?t=261857
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http://imperialroyalarms.com/thread/5847/arkms-tfa-graflex-build
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The links being posted are to Tactile Switches which I understand are used for the "Red Button" activation button but are not the switches referred to in these threads, which are snap action switches.
What am I missing or not understanding about setting up the "Side Slider Switch" as the aux button.
Any help explaining the process for setting up the "Side Slider Switch" as the aux button and a link to the switch would really be appreciated.