I have a woods RC6 rotary cutter which I am in the process of servicing. I removed the plug located on the rear bottom of the gearbox and drained the oil. I then removed the top vent to fill it back up . At this point I checked the owners manual to find out how much oil to put in. It said to add oil until it comes out the side plug hole, I look on both sides and cannot find a side plug . Anybody have this model of rotary cutter and tell me where the heck it's located