Just go ahead and remove the pin, if the plunger still won't move, at least the hole will allow more penetrant into the small channel.
You may have to grind a very fine "starting" punch to get the pin to move. It is likely well stuck also.
A Little heat won't hurt, just till the residual penetrant bubbles or catches fire! BE CAREFUL.
Hold the piece with tongs and apply heat slowly or just put in a 350 degree oven(the part, not the solvent container!)
Then let it soak for more days.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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