If you want to take a laminated lock apart without ruining it, and have access to a
milling machine, try using a non-center cutting end mill. If you plunge down on the
rivet, you can remove the metal from around the shaft or hole. If you are able to do
this, you can take the plate off, pull the core. Once you put the lock back together,
you can peen the rivet. If you have the right bit, one will hardly notice the lock has
been taken apart.
I used an off the shelf four fluke end mill. I suppose a place that sharpens end
mills could grind out the center of the bit. Might even be bits out there for removing