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It's not just a 12pt 12mm , it's a 12 pt STAR head socket you need. You'll need to go to a hard core tool store like Sears/Craftsman to find it.

Then, if you ever have to take the crank girdle off the bottom end, you'll need a 10mm STAR socket. FYI

ahh thank you i new it wasnt the right socket..thanks ill try today..

nah is not a star socket, i remember it was a 12 point socket, cant really remember if it was 12mm or 13, try both.

12 point 12 mm socket. Not a star or torques socket.

Search for "Head Bolt size" using all words and find this 9 posts down:

http://www.mx-3.com/phpbb2/viewtopic.ph ... 09&start=0