Thanks Brett! I was able to remove the lock cylinder and put a short piece of tubing in series with the cable housing to make the cable tighter, and the button works fine now. At some point I'll remove the glovebox to get at the adjustment wheel, but it works fine for now.

Took a weekend trip this past labor day, she gets about 23 mpg on the hwy at about 85 mph. Is this typical? Also, I'm noticing that she is a little hard to start, requiring a few seconds of cranking before she fires up. Then the idle is a little rough for about 4 seconds. No check engine light. Is this likely to be a temperature sensor? I think I should also probably replace plugs, cap, rotor as a matter of course.