Bongo Fury

I had reason to remove the engine undertray to aid with lining up the belts on the crank pulley. Unfortunately most of the nuts sheared as they were rusted solid, wishing i had squirted a bit of WD40, I have some work to do to drill out whats left in the captive nuts and replace them. Just after any tips that might be known before I make a start. Thanks

Can't help but will be watching any replies as I have a couple gone but enough to hold it for time being. When the next couple go I'll have to do this too.

WD 40 applied & waiting for tips hints that will ease the process

Screw extractors ? http://tinyurl.com/khezxx3

If there is some of the remaining bolt protruding from the back of the captive nut, and there is reasonable access to it - apply lots of heat from a blowlamp then unscrew with a pair of molegrips. Otherwise, drill-out and retap or simply screw a big self-tapper into it!

Thanks - do have some thread showing up the top - I don't have a torch but I do have a heat gun - heat should break the rust seal and make it a lot easier to extract whats left ---just wondering if I might get a double nut on what there is of thread - trial and error - If I remember the bold are 10mm - will give it a go when the weather is a bit better