Turntable clamp, hence tt clamp, or record clamp can be a very useful accessory, especially when playing slightly warped records. The clamping disk is made of POM (polyacetal), stiff plastic material, with excellent damping characteristics; collet chuck or the clamping sleeve is made from brass which is softer than aluminum, stainless steel and other hard materials usually used for the turntable spindle, allowing a good grip to spindle; locking nut is made of aluminum, stiffer than brass, so ideal for the locking nut tightening task. Depending on the platter/mat design and particular record thickness and warp state, Soulines clamp requires user to place a washer around spindle before placing a record onto the platter and before securing the clamp, thus two pairs of washers of 17mm and 23mm diameters, made from cork and rubber-cork are included, allowing user to experiment and use the right one (or a combination of a two) for the best results.