I have an aluminum boat, I was removing a front bench that is riveted to a small aluminum wall. I was drilling out one of the final rivets when a small problem occured (the drill bit broke inside the rivet.) Since the bit broke below the rivet's surface I cannot reach it. And trying to drill it through the bottom cannot be possbile because the angle of the hull does not allow the drill to fit. So if anyone out there has had this problem or anyone with a solution please tell.