Threads on right side crankcase cover messed up

[eman13261]

So I was replacing my tach drive gasket and O-ring and everything went smooth. The last bolt I put on was #5 on the diagram below. Anyway the bolt shaft snapped off from the head so I bought a new one was went to back it out with a drill (something I've had to do dozens of times). Long story short I did something incredibly stupid the bolt is still stuck and now my thread of the crankcase cover is messed up. Aluminum is notoriously hard to rethread and even if I did I don't think it would line up correctly with the hole in part #1. So I think my only option is to buy a new crankcase over...any thoughts?
http://i1020.photobucket.com/albums/af327/bmwbobz/Engine/TachDrive.jpg

 

[angus67]

How did you get #1 out if you didn't get out #5?

 

[eman13261]

This happened after I replaced the gasket and o-ring, putting #5 in was the last thing I had to do and thats when it broke

 

[XSLeo]

There should be enough room around that hole to install a Helicoil thread insert.
Then make another bolt like the one that goes in there.
It only holds #1 in the case.
Leo

 

[evil 650]

try this it worked great for me

loctite form-a-thread, stripped thread repair kit

http://www.amazon.com/Loctite-Form-A-Thread-repair-kit-grey/dp/B000WSEUII