Guys, I have a persistant oil drip on my hydrolic pump on one of my wd45's. The leak is a very slow but persistant drip and it is coming out of the large adj. screw located on the top of the pump,its one of the "hold" adj. screws, the one that runs horizontil on the very top. It is the screw labled "A" on the batt. box diagrams or in the manuels. It also has the fairly large knurled knob on it,and if you back it all the way out it goes up against the little pointed stop that is screwed vertical into top of pump.The leak is seeping out around the threads of the adj. screw. I was wondering if there was an "O" ring type seal inside or what is letting the oil seep out. Sorry for the long post but wanted to explain the proper screw. Thanks for any help, Hoss