Bob wrote:
I've searched for info on this before, and always came up empty. Seems
the consensus is that most stud finders (like my 'Zircon') fail to
detect through tile.

Just wondering if anything has changed, given the marvels of modern
science g or if anyone knows any tricks. I'm not a carpenter, by
any stretch, and don't know much about removing tile, etc.

Use a strong magnet to find the nails. Take the magnet out of a dead harddrive.

I just tried it using a magnet from an old 5 1/4" HD. The magnet would stay in
place over the nails in the shower I built a couple years ago with tile probably
3/8" thick.