I just remove the leather seal and soak overnight in mineral spirits. Brush it well with a toothbrush to remove any contaminants; then slosh it around in the mineral spirts one last time. After it dries out, saturate the seal with chamber lube and let that soak in for an hour or two then put some more on it and let sit a little longer. You could just immerse it in the stuff. I use RWS brand because I have several bottles on hand. Some guys use a mix of neatsfoot and silicone oil to freshen leather. Don't forget to inspect the leather closely. If it's damaged or torn then toss it and use an adapter kit or find a new leather seal. I've had good luck making my own leather seals, but that's for another thread.When you say freshen the leather piston seal do you roughen them up a little with sandpaper ?
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