1.   I have an axe to grind -- well, actually, two axes.

2.   If that sounds like Roberts has an axe to grind, dismiss the idea.

3.   Many confidential providers of information have an axe to grind, or else they would not be offering it.

4.   These people have no axe to grind.

5.   What you can say is that the CBO has no axe to grind.