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Drill is a good option, if you can - it depends on what kind of fixing it is:
If it's a screw head at one end and a 10mm nut at the other, then a nut splitter is a good option, or saw the bolt flush to the nut, then drill the bolt from that end - you should be able to drill out the bolt and some of the nut thread so it quickly loosens. As soon as it loosens, make a little space and start with a hammer to free the bolt itself, using the nut as a drift to prevent you hammering the material it's screwed through.
If its a "blind hole" with a 10mm and cross head on the same end, its a PITA - as you have got to get the whole bolt out to refit it after, and while drilling is an easy way to remove the mudguard, you end up with a bolt that is virtually flush to the thread surface it it stuck into. That means easy-outs (which should be called easy-snap-swear-plasma-arc-removal instead) I'm afraid - or a long careful drill and probably a helicoil afterwards.
The only instant messaging I do involves my middle finger.
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I think you've given me an idea; not that I have the tools.
The bolts go through the mudguard. On the top/outside is a flat cross head [not Phillips], the bolt goes through mudguard and the support bar. The on the underside/inside is a washer and the nut.
If I can split the nuts off [ooh err Mrs!] I can do the job. Then all I have to worry about is replacing the nuts & bolts.
speramus in juniperus
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If you've got the space, it's the easiest way: Damn good[^], Cheaper but very effective[^] - or you can get hydraulic / pneumatic ones if you have the kit which will go through the nut like a coder through bacon.
Or just use a hacksaw and go down vertically through the nut and bolt to cut the nut in half - don't try a chisel as they are a PITA and tend to slip and make a horrible mess...
The only instant messaging I do involves my middle finger.
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I'd persist with the WD40 for a while - On the Spittie I'd occasionally have a go up to a week with the stuff. Liquid magic.
If you still have problems:
This page should help[^] The first option(the nut splitter) is really good if you have/ can get access to the nut. I've not use the screw extractor, but worth a punt? Also, sometimes heating with a blowtorch and giving, when cool, another soak in WD40 sometimes works. If the nut head is totally gone, occasionally mould/vice grips will get purchase.
[Edit]
As I say, I've not tried them, but the screw/nut extractor looks handy: this video[^]
Pure drilling into a threaded bit of bodywork is a PITA: you end up having to re-tap the thread, which then is necessarily larger than the one you extracted. Thats assuming you can drill out evenly in the first place.
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Keith Barrow wrote: you end up having to re-tap the thread
Or fit a helicoil[^] which briongs it back to the standard size. I've gone through a few of these in my time...
The only instant messaging I do involves my middle finger.
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Oooh. I wish I knew about those ten years ago.
Still, the drip-drip-drip tactics are on with the wife for a new classic car so good to know about!
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Oh yes! That way you don't end up with six bolts one size, and the final one different, or a different thread count, or... 
The only instant messaging I do involves my middle finger.
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I are doing the same vis-a-vis a new motorbike. Type identified and approved by herself. Money has to be mine...
speramus in juniperus
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If the head of the bolt is big enough and your hands steady enough you can use an angle grinder and cut the sides of the bolt in parallel and then use a spanner on it.
But don't blame me if you destroy the mudguard in the process.
If you haven't used WD40 yet you can use oxalic acid instead, it's more efficient against basically any oxides. But it's water soluble, so it's not usable on greasy/oily surfaces.
And watch out, it completely destroys the look of anodized aluminium.
Be excellent to each other. And... PARTY ON, DUDES!
Abraham Lincoln
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Use a hacksaw to cut a slot in the bolt heads for a screwdriver, and if you've got an automatic punch, use it on the sides of the bolt a few times.
[edit] Use the punch on the sides of the nut, not the bolt.
I wanna be a eunuchs developer! Pass me a bread knife!
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For problems such as these I use a Dremel MotoTool.
I can reslot the bolts, cut off either end (depending upon accessibility), and otherwise cause mayhem limited only to the target component.
It's a handy and precise weapon for many battles.
| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "As far as we know, our computer has never had an undetected error." - Weisert | | "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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W∴ Balboos wrote: It's a handy and precise weapon for many battles.
Oh, sure.
... If all you fight is fairies at the bottom of the garden![^]
Never underestimate the communicative effect of a smack in the mouth
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Unless you've rounded the heads off I suggest getting a bigger cheater pipe to stick over the end of your ratchet. Adding 4 or 5 feet of pipe will turn you from a pasty faced code money into He-Man.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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Dan Neely wrote: Unless you've rounded the heads off
even in this case all may not be lost. A good Stillson wrench can get a purchase on almost any metal surface if there's sufficient space to use it.
Andy B
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If it ain't a Mudder it ain't worth saving. (Or elbowing some Mother's into.)
Heghlu'meH QaQ jajvam !!!
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I lost my otherwise professional demeanor at T.B.A. [^] 
-- RP
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"Weep softly facing good beat and highly extreme method of obfuscation."(12)
Difficult but solvable.
---------------------------------
Obscurum per obscurius.
Ad astra per alas porci.
Quidquid latine dictum sit, altum videtur .
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Weep CRY
softly P
facing TO
good G
beat RAP
and highly extreme HY
method of obfuscation
CRYPTOGRAPHY
Couldn't let you win again! 
[edit]Finger trouble - swapped the P & T  - OriginalGriff[/edit]
The only instant messaging I do involves my middle finger.
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OriginalGriff wrote: Finger trouble
Disadvantage of using the middle finger,eh? 
Signature construction in progress. Sorry for the inconvenience.
Damn you have the perfect signature - CBadger
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OriginalGriff wrote: Finger trouble - swapped the P & T
You don't want to do that in a nice cafe.
I wanna be a eunuchs developer! Pass me a bread knife!
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Movie Quote Of The Day
We Transylvanians always look on the brighter side of death.
Which movie?
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Ummm.. 
Hotel Transylvania ?
Not familiar with this...  
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Underworld - Prequel of the prequel
Signature construction in progress. Sorry for the inconvenience.
Damn you have the perfect signature - CBadger
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The Conservative party conference
Every day, thousands of innocent plants are killed by vegetarians.
Help end the violence EAT BACON
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There's a brighter side of death?
I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is (V).
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