Fairly standard problem, can't seem to find anything close to a solution..

17" ftr on my efII xr8, wheels need removal but they have lock nuts and I don't have the key..

ive tried making my own tool, brute force and used a punch/chisel with a hammer to try and jar the nut..

any help is appreciated

Use a cold chiesel to hammer in a slot in the top of the nut, then use an Impact Driver with a large flat screwdriver bit, and go from there......thats all I got.

You can buy lock nut removal tools from supercrap or ripco

Had the same issue when the bloke I bought the wagon off didn't include the key. Tried double hex sockets which did nothing. Went to a tyre shop round the corner, who said they can use their 'special machine' to pull the lock nuts off and possibly damage the thread, for a cost of $70!!! Told him I'd be right back (not!), went a bit further up the road to an independent place who were absolutely awesome (I see you're in Melbourne, they're good blokes at Highway Tyres in Mitcham). They tried for a good 20-30 minutes, bashing on a series of impact sockets and rattling them off, until they finally found one that worked without just spinning off.

Best of all they did the 20-30 minutes work for nothing!