I have a Woodford frost proof sill cock that leaks from the handle. But it only leaks when under pressure (for example, when a hose is attached and the water is turned on but the spray gun on the other end of the hose is not open). I have tried tightening the nut to no avail. I guess its a bad seal or packing or something just under the handle. Can anyone tell me what I need to replace and/or where I can get Woodford sill cock replacement parts? Does anyone know of an exploded parts illustration I can refer to? How about plumbers putty – will that work? How about oakum – will that work?