Hi, I'm trying to remove the Grain Mill attachment from a Champion Juicer. Thus far it seems obvious: the mill is configured so that with a simple quarter turn the mill can be disengaged from the juicer's spindle. However, I simply can't seem to remove it! I've tried shaking the unit and brute force, but short of disassembling the unit and taking the whole thing apart, there's not much more to do! Any suggestions?