1/4 drop of DeoxiT per contact applied from the dropper bottle. Spraying is not good for the insulating wafer. I get DeoxiT from Electronic Supply of Ames, 515-232-7020, they do have a web site. 73, Jerry, K0CQ, Technical Advisor to the CRA -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only.