Power steering leak

Well, my boy bought a '67 El Camino and has found two issues that need immediate attention. One is brakes, should be no problem...flush the system bleed and adjust. The other is a leak at the power steering box. It's leaking at the adjusting screw, is there a seal that is easily replaced? The steering works well, no slop, no wandering....it just leaks.....a lot....

http://www.geocities.com/ceh383/pump2.jpg

Thanks Denny, I figured there was.....never taken one of these apart, wanted to be sure.