actually these sockets I'm talking bout arent standard 12 points, they are a weird design that really does work, they have a sort of square-ish point instead of triangle and they grip the bolt like its welded on..

 

i agree with using an impact driver, just don't use cheap one

 

Yeah, Metrinch is different to a 12-point, they're more like a 6-point just they grip the flats, not the points (they only have the same number of starting points as a 6-point too)

Irwin Bolt Extractor for the win if the head is rounded off

http://www.irwin.com/irwin/consumer/jhtml/...IrwinProd100512

 

Metrinch is good but not that good - not good for tight areas and i've had them slip off and also start rounding off heads

heaps of crc, the biggest bar plus spare exhuast u can find, and someone to push down on the bar so the socket doesnts lip off the bolt.

 

if the bolt is rounded try useing the socket a size down and hit it on with a hammer then use said method

yea i have a prob i can't get a socket in the spot i want trying to get the pumkin off the fly wheel and theres no room for any thing and ive already rounded it off when i use a huge leaver so no i don't no what to do

Oxy torch and a cold chisel.

 

Or drag it to an engineer and they might see if they could weld a nut onto it

Then again they might even just use an oxy torch and a cold chisel.....

becarefull to with head bolts, i snapped one undoing it on my 4k, ended up with the 4k living in the bin as it was stuck in real good