| After sanding the bearing edge did you check it,s trueness? A flat surface such as marble or granite (glass is not even enough) and shine a light from the inside, check the outside for light coming through.
Tend to agree with Skinslapper re head choice and tuning tips, the torque key will only get you in ballpark.
Replace the screw, not a difficult or time consuming task.
If it is still dull it could be a dud drum head, they are not all perfect. Substitution is only way to find out. |