Cause of slight vibration (or "rough" feel) at top of clutching when shifting gears?

What is your question?

63k on car. Usually very smooth feel when clutching until recently. At the top of clutching only there is feeling that the clutch shaft has developed a "rough" spot on the shaft or a feeling of a slight vibration when shifting. It occurs, seemingly, when the rpms are 3k or above more than below 3k. No other symptoms; fluids are topped off. Thank for you help.