Turntable weights do work. However clamps the grip the spindle can create a downward force that your won't get with a weight unless you use 20 lbs or more. The downward forces created by a clamp can far exceed the practical size for a weight. And clamps only weigh a few ounces. The Clearaudio that Tom has is probably close to "The Clamp" made famous by Polk Forum member Hearingimpared. The goal of the clamp or weight is to couple the record to the platter. Sound improvements in bass depth, slam, soundstage and dynamics are common. Usually, the changes are more than subtle.