I bought my HP 23/52 for residential use to reduce mowing time. Well I've been watering my lawn like crazy so I have an excuse to get on the HP. I just hit 8 hours and did the 1st oil change. Surprisingly I was able to hand loosen the nut that acts as a valve for the oil drain spout. I hand tightened the nut and as soon as I added oil it began to drip out. To stop the leak I had to tighten the nut by wrench with considerable force. I had to use a chain wrench to remove the filter because I couldn't find a filter wrench to fit. What size is that drain nut on the 23 hp Kawasaki so I can get a socket for it? Where can I find an oil filter wrench to fit? And am sure it's been posted before, but how do I avoid those pivot divots? I try to simultaneously reverse one wheel while advancing the other during the pivot. Any tips?