J.A. Michell Engineering Record Clamp. Original standard-size aluminum model. Highly effective at reducing vibrational energy, coupling the record to the platter and flattening mildly warped records. Place the felt washer on the platter beneath the record. Place the clamp on the spindle over the record label, press down slightly to flatten the record and couple it to the platter, and then tighten with a quick turn of the knurled knob. It tightens easily on unthreaded spindles. Lightly used, in excellent condition and very nice looking on any turntable. At my price, I will pick up PayPal and shipping to continental US via USPS.