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Interesting. I have the same problems (very difficult to turn the key) and, of course, replaced the switch first. Then I sprayed the barrel with brake cleaner, but with only temporary success. A new (OE Porsche) barrel is on its way; I don't want to take any risks here, but of course I have thought about your approach.
I believe that the previous owner tried to restore mobility using unsuitable oil or grease, and now the thing is contaminated with dirt, and the low temperatures are contributing to the problem.
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