Originally Posted by Gungeek Silicone oil lubrication for old guns with leather piston washers was recommended. Is that now considered bad? Regards ... Geek Cheers Geek I'm still no wiser as to what is used now. I only asked the question because John Bowkett and many other top tuners used to recomend SM50 or MS50 on Synthetic and O ring piston heads. Thanks again All the best Mick
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