It actually sounds like he's talking about the ram sleeve.
If this is the case, the sleeve set screw, under the body, should be removed. Once it's out, clean it, and apply red loc-tite to it. When you screw it back in, be careful not to overtighten, as the sleeve will become warped and a leak will be caused.
While it's not necessary to completely remove the frame from the body to do this, remember that the two frame screws are different lengths; be sure to put them in their proper spots when tightening the grip frame back.