Larry Jaques wrote:
The tin I worked with had a _center_ nail or two. I thought that was
what you were looking to remove. Perimeters are mucho easier (but
still a major pain.) ...

Yes and no. We remove the nails on one side, from the front, as shown.
Then with that side loose, we go behind the tin to remove the nails on
the other side from behind. Reaching behind the 24" wide panel gives us
the need for a long bar.

Then again, tin is easily beat back into shape on the edges. Stock up
on repousse hammers and make wooden dies for the edge shapes with a
dremel and tubafore if necessary.

Indeed, but we'd like to avoid as much of that as possible.

I'd also use a scribe to remove the paint from that joint so you can
see the edge you're after a bit more clearly.

Good point.

Thanks,
Bob