The rails are originally set with Phillips screws. I have to congratulate Petacos for that clever way of assembling their rails. There is no risk of damaging the rails during the dis-assembly and no risk of scratching them during the re-assembly. The rails are in very good condition and forty years later, the stainless steel is perfect.
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The rails are treated with Collinite 850 which is a cleaner, wax and sealant for metals. The bonus is that your fingers will leave practically no trace. I use Collinite products line for my cars (845) and I like their products. This is commercial/industrial quality.
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Of course, the screws are brand new. No need to re-use the old stuff, which was not chrome plated......
Yves