1. Tighten the wing nut. The wing nut is located at the base of the high hat stand pole. If it is loose, it can cause the pole to wobble. Tighten the wing nut until it is snug.
2. Check the felt washers. The felt washers are located between the cymbal and the high hat stand pole. If they are worn out or damaged, they can cause the cymbal to vibrate and make the pole shake. Replace the felt washers if they are worn out or damaged.
3. Make sure the high hat stand is on a level surface. If the high hat stand is on an uneven surface, it can cause the pole to wobble. Make sure the high hat stand is on a level surface before you play.
4. Try a different cymbal. Some cymbals are more prone to vibrating than others. If you are using a cymbal that is prone to vibrating, try switching to a different cymbal.
5. If the high hat stand pole is still wobbly, you may need to contact the manufacturer for repairs.