I installed a Milemarker 502 part time kit in my 203 and then proceeded to top it off with gear oil. Right as it topped off, I remembered that the 203 is supposed to be lubricated with MOTOR oil. Argh, dumbass. So, I figure I'll drain it and start over. Well, theres no drain plug on the case. I looked in the factory manual, chiltons, and haynes, and the pics they have show a drain plug on the bottom. But mine does not have it. However, it does have the boss where a drain plug is supposed to be drilled. So, I am wondering if it would be ok to drill the hole, and trust that the escaping fluid will flush out any metal bits caused by the drilling. After it is drained, I'll tap it for 3/8 npt and run some more fluid through it to flush any more bits of metal out. Does anyone know if there is anything just inside the case where the drain hole, that I should be worried about while drilling and tapping?