hello my friends. first of all, sorry for this question that can seem little ridiculous for a mechanical engineer... it's related to the clutch mechanism/case failure in the 2007 G650X. I decide not to change the entire case and instead I'm going to ask a local machinist to make a bushing for the clutch case hole, as others here already did. My newbie question is about the measures of the hole in the case compared to the release bearing (BMW #21217709526) that goes in it. How much "play" (or clearance) is supposed to have between these two in order to not have any issue as: 1. too much "play"/clearance between the two, of course, as this is the very first reason I'm doing this, to remove the excess of wear in the case hole; 2. extreme low clearance between the two pieces making clutch engagement and disengagement sticky/heavy or even stuck. I know I could simply trust my machinist, but that's not the case. I want to make sure and, most importantly, to learn.