Took bolt out only to find the last 1/8" of the threads left in there. What are my options?

How would this bolt break?

Ok - what is another option for getting the primary off so I have better access to the rest of the bolt? Could something "jack like" go between the case and the primary and push it off? Kind of the opposite of a bearing puller?

Also does that bolt bottom out on something? If I was able to drill it out I dont want the shavings to get into the crank case.

its solid behind the hole i believe. probly would not try to put something between the case and the clutch. one or the other will give and something will break. have you tried your clutch puller?