Did my first oil change today with less than 15 miles on her. I was in a hurry and I think my heart my have missed a beat when I dropped the drain bolt and NOTHING came out! Well, other than a long spring. Quickly realized I had taken off the wrong bolt to drain the oil. Probably have done 50+ oil changes on bikes in the past but felt like an idiot when I figured it out. So anyway, what is that other bolt for? It's a drain of some sort...has a magnetic plug on it too actually. Just wondering.