Ughh...snapped timing cover bolt...

[sptt]

While resealing my w124 timing cover for the 4th time with the right seals and RTV, I snapped the top right bolt off that holds the top part of the tensioner damper bracket to the cover when putting in back together. The bottom right bolt is doing a good enough job sealing the right side and holding the damper. I have tried every drill bit and hardened tap drill I had and cannot drill a hole into the bolt to get the tap in to twist it out (two drill bits broke). Is there a special, sharper bit, I need to use on these bolts? I went to sears and bought a Micro-Bolt remover set that didn;t do anything. I only have about 1.5 mm of the bolt sticking out when the cover is off...ughh I'm thinking about just clamping the top part on somehow.