The t-bar adjusting bolt is a fine thread fitting and its location makes it very suceptible to corrosion. I would think that as long as everything is still intact you are fine. You are very lucky as mine had to be adjusted with a 4' breaker bar and I broke several wrenches doing it. This is with a butane torch and pb blaster. Most people think there is a problem because they *cant* turn the bolt...

CHRIS
98 Amigo, 92 Pup

need a pickup 1st gen fuel level sender