Someone said:
"The cuing problem does sound like wear on an end stop which stops the arm as it swings around and allows it to drop down on the record surface and is probablly adjustable from underneath the chassis."

My reply:
"Your answer makes more sense to me than the other suggestions I have gotten regarding lubrication of the speed changing mechanism. Where do I find the end stop(s?) Are there different ones for each speed?"

If you know the answer, I would appreciate it. Thanks again.