Obscenely heavy trigger on 1912 P08, "two fingers" heavy

[DonVoigt]

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.