Intermittent total loss of electrical

Mattax said
Your key probably looks different. The ignition key (maybe switch too) was changed many years before I bought it.
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To seperate the lock cylinder from the switch, turn the key to run (or any position other than off) and deperess the brass pin.

I bought a Standard US50 switch (left). Quality seems OK and the positions are correct for '67.
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Thanks for the info. I have a replacement switch and got the old one out of the dash easily enough, BUT... I wasn't ready for the tiny brass tumbler springs to be all loose when I separated the cylinder. I would swear one of them launched when the cylinder came out, and I'm not optimistic about being able to find it. It looks like the last spring is missing (if there is one)...

That tumbler doesn't seem to move much when I turn the key. I am hesitant to put this back together if it is missing a spring. Afraid I won't get it back apart again if there is an issue. Any thoughts? Am I calling a locksmith?