You're welcome, Harry. And yes - great thing about these forums - I learn new stuff all the time here, which, as you say, is always good!

Heh... I originally thought the CSS remained intact inside MOBI files.

It was from people here I discovered that wasn't the case, and found the tools to start digging into MOBI files to see what actually ended up in there. I can get a bit obsessive at times about wanting to understand
exactly what's going on "under the hood".