Don,
You might want to try Liquid Wrench which can be purchased at any hardware store. A few months ago I purchased a model 92 Winchester that was manufactured in 1894. From what I could tell it had never been disassembled as ALL of the screws were frozen in the receiver. Just for the fun of it I tried a different type of lubricant on each screw: WD-40, Kroil, Moovit, Liquid Wrench, and Break Free. The screws where I used the Liquid Wrench all came loose after three days of soaking. The screws where I used the other lubricants were all stuck tight after three days. After I applied the Liquid Wrench to the other screws they also came loose. Even after soaking for several days there was not any damage to the gun blue. Liquid Wrench may be considered out of date by some, but I use it often when gunsmithing. It is cheap, readily available and most of all it works!
Scott
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