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Dude!, If you don't have a 12mm wrench, then I'd say NO, YOU DON'T HAVE A TOOL SET!!! 
And yes, I do have a 19mm wrench. (socket too) 
On the other hand I've been wrenching since 1972 and I didn't have either size since they're not commonly included in Allen (hex) sets. Never need 'em from my '68 Mercedes 250S through all my metric bikes until now.
Joe, go to Lowe's and buy a 12mm Kobalt hex socket, they're made by the same company that makes Craftsman and SK and then turn a 5/8" spark plug socket inside out:
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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