Wheels won't come off!!!

Hi bought a CLK 230K just before Xmas, just trying to have a service and new brake pads and the 2nd lock nut key has sheered off - so can't get the wheels off!!!! Any tips / solution preferably or ideas greatly appreciated
(seller not interested now)
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If you got a stub/head left, it is fairly easy... most tire shop will have a reverse spline socket that grabs the metal and spins it off... it grab tighter as you try to remove the bolt. Just bring a spare lugbolt before you go... otherwise, you will have no lugbolt once removed... and it is not good without it.
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