Here's a picture that might help. The screw that the screw driver is on is the interlock bleed screw on the right side of the tractor. Loosen the jam nut, or remove the cover nut (as show in the picture) and then turn it in until it seats. If you have the jam nut, the seal in it will most likely leak after you turn it. Just get a 3/8 lock nut with the nylon in the end, run it on a bolt to set threads in the nylon, and then take the interlock screw all the way out and put the new nut on it, preferably with a new copper crush washer behind it. Don't use a tap to cut the threads in the nylon, because then they won't be tight enough to hold back the oil.