Interesting
"I literally turned the screw CCW at least 6-7 full turns.(what could go wrong??) The table did slow down to a snail pace faster that 33.33. I use a Cardas Frequency Sweep record that has a strobe on one side. I place the needle on one of the frequency sweeps and then hit it with a strobe light. So, at least, for today, it is again working,"
I believe that turning the speed control screw wiped the contact clean , try doing this in both directions 10 times and then check/adjust with the Cardas timing label .
I am curious about the Mobil oil , is that recommended ? I use a lightweight oil without any detergents as recommended and purchased from GEMS maker of George Merrill Turntables .