Seems to me I read something about the length of the bottom screw being important, so as to block the drain hole which is uncovered by slacking off the screw, thereby allowing drainage of the filter oil into the sump, rather than into your lap. If the screw/stud is too short, the hole remains uncovered and some of the oil goes directly to the sump instead of the the oil galleries, leading to insufficient oiling at vital points in the engine.
The disadvantage of the studs is that you can't do the preliminary drain of the filter housing, so things tend to get messy at filter-change time, but hey, I guess thats something one could get used to.
Anyone know the length of the bottom drain screw, ie how long the stud would have to be? Lets say the bottom thread of, uhm, my cousin - yeah, my cousins XT is stripped: what size stud would I, uhm, my cousin need to fabricated, and would he need to cut a new thread into the case, or would the stud cut its own thread?
Thanks in advance etc