I recently acquired several different airtools that are several decades old. I would like to rebuild them since a few of them have leaky gaskets. My concern is that it is probably going to be rather difficult to find replacements due to the age of the tools. Most of them were made by Rockwell but I can't locate many replacement parts. Does anyone know of a simple fix to this? Is there any type of silicon or other liquid that I could use to make a gasket. Many of them are rather intricate, resembling a transmission pan gasket, so they would be pretty difficult to cut out by hand.