Man! I am really guilty of taking the lazy approach to this problem. I finally removed the screw to inspect it and sure enough it has an o-ring in a groove on the thick upper body of the screw. The o-ring on this one is junk so it doesn't seal and make enough friction to hold the screw from vibrating out of position. I had a little pipe dope handy so I goobered up the threads and now it holds fine. I'll look for the correct o-ring tomorrow and do it up right. -- Matt

'89 4runner SR5, 3.0, auto (fun)
'93 xtra cab, dlx,3.0, 5spd (work truck)