diff tool, SourceTree integration? Follow

So, I've been using SourceTree and mercurial for managing my source files.. I love the diff tool built into idea but, has anyone tried intergrating it with SourceTree?

I've had a few attempts but to no avail.. I've scan the forum for similar cases, esp. this thread but haven't managed to use the recommendation to any effect :(

Any help or guidenice would be much appreciated

Cheers
Antonio