Thinking PVC, 7.5 mil mylar bag (possibly double bag it) and 2 packs of oxygen absorbers. I've heard dessicant counteracts what oxygen absorbers need to work properly, so considering just sticking to oxygen absorbers. That begs the question: to lube the metal items or not? I've heard it breaks down and hardens up to a crystal over long periods. On the other hand, lube helps prevent rust, but so does a lack of oxygen. Theoretically you should be good with oxygen absorbers, especially if double bagging. I suppose it's best to lube the metal but not go overboard like with axle grease or something like that. Just some regular lubricants? Also, since it will be in PVC, should one double bag it with mylar bags? Or will one suffice? Apparently there is almost no oxygen transfer with two, so low that it's not a hazard. But over a decade the mylar apparently lets in some oxygen. Perhaps best to just lube, use oxygen absorbers, single mylar bag and check storage every few years? I would presume checking after at least a 1 and 3 year interval to be a good idea, so that you can see whether it's working or not. If lucky you might stop it from permanent damage?