Wilson trimmer holders storage

I wrapped mine in a oily rag inside a zip lock, corrosion has not been problem, and I hardly use it anymore since getting my Giraud, another trick is to apply a couple layers of car wax to the bare metal of the Wilson trimmer and holders
 
I store mine in the desert. Lightly oil them maybe once a year. No rust, even when it rains for a week. Maybe it takes some time for the humidity to soak in???