[Gustav]

I'm pretty sure mine's like that aswell,but as has been said it's not a problem,the hole just has to be big enough to allow the top shaft through

.The problem with mine,and others aswell,is that hole on the other side of the case isn't milled deep enough so it compresses the top shaft bearings and causes binding when you tighten the case.The solution is to either grind some off the end of the top gear or if you have access to a mill then run an endmill in there to make it deeper.Hopefully yours will be OK though.Other thing is, it may need some grinding inside the case to clear the idler gears(mine did)