Yes I screwed up big time on my 85 K100 . Had a small leak on the crank seal and it looked like I just needed to move it slightly so thought I would give it a shot. drained the oil and removed the crank case cover and moved the seal / gasket into proper position. As I put it back together I over torqued one of the top bolts (2nd from the oil fill cap) . The bolt broke and it actually broke pretty low , not flush. So I proceeded to drill it out with no luck, used 2 different extractor tools and still no go. One time while drilling the bolt caught and went deeper, think it welded itself too. My stubbornness and lack of patience caused more problems, I cannot even get a bolt to start to thread on it. Any suggestions at all, I know I have to have this bolt and grommit in place but am in a panic now on how to fix this.