I started digging into the sheared off bolt with my new HSS left hand bits, just to see what I'm up against.
the bolt is actually not bad for drilling.

sharpen the bit just like a right hand bit.

How does one sharpen a drill bit? Never done it.

I can't address your other questions, but left hand drill bits will make holes just as well as right hand bits made of the same material. I hope you purchased quality bits. Bits marked HHS for High Speed Steel would be the minimum specification. Try to lubricate and cool the bits with oil while dri...

I remain grateful for your help. I'm concerned about staying true with the bolt for the whole 50mm I will need to drill. I'm also wondering about the effectiveness of using left hand bits for the whole process. Will they drill as well as regular bits? Another question is the material I'm drilling in...

These are old, mean, and hardened bolts. Be prepared to drill through the full length of the broken piece. Here are few pointers: determine what drill bits may be used (beginner, intermediate, and final), is there a need to insert a pvc support sleeve to help keep the bit relatively straight, need ...

it's a 100mm bolt from the end to the washer face. About 1/2 of that is in the car. Good to hear that those lefty bits may just drag that thing outta there. How is it that it can free up in spite of all the heavy torque that snapped it in the first place? Not doubting, just trying to learn. Me, I'm ...

I appreciate all the feedback. I would love a little more insight into what I'm drilling into, and any perils of this job or more clarity on it. Research and prep is always key for something like this. I have a set of left-handed bits on order–I would like to avoid removing the subframe, but I will ...

Are you using the old relay or the new relay?

Dropping subframe isn’t too bad. Are you near me in NE? I can loan the engine carrier and save you fabbing one. I do need it back to a steering rack but time isn’t critical right now thanks a ton, that means a lot. i already have an engine support in place. Looks like I picked the right forum. I li...

Yeah, I am well aware that I screwed the pooch here. Believe me, I know. The question is, do I now have a pile of scrap or can I work through this? Pretty obvious I will need to drop the entire subframe in order to get at that bolt with a drill bit. Thanks again for your feedback, it's a very disapp...

That is a locating nub for the subframe. There are two on that side (1 front and rear). Helps keep the SF square under the frame. That's gonna be a bear to get removed, I think. Thanks for identifying it. I ran into a bit more than I bargained for. Any further help on my approach is welcomed. The m...