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The Shimano pins that do not have the break away piece should never be pressed back in.
That's likely not how they are installed at the factory. They're probably a different shape when they start, they likely do a 2 step process where the ends of the pin are not flared to start. The pin gets pressed in by a tool in step 1, then another tool probably presses down again to flare the ends to hold the pin in place.
This method doesn't damage the links... and it's also the process you use to rivet chains together on installation that require a stronger connection than bike chains.
Not getting why you'd ever grind away with a dremel to break the chain either? You can just press the pins out and replace with the quick link unless the shimano quick link is unlike any of the others?
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