That's the fill plug. The drain requires that you unbolt either part of all of the nosecone. I'm posting because Joe B (bigpoppax2 on planetisuzoo) found a spring loaded coupler that will probably eliminate the "clicking" noise that many seem to have. If I were you I'd hold off on changing the oil for a few weeks until you hear from Joe about that coupler. It would be the perfect time to change the coupler.

-Tad