Try reading these threads for ideas/help.
The tumbler and/or steering lock will need to be replaced with new.



How not to remove the ignition lock! Butchery at its finest.
http://www.peachparts.com/shopforum/showthread.php?t=148451

R129 - Ignition switch replacement "post #21."
http://www.peachparts.com/shopforum/showthread.php?p=1138367#post1138367

Ignition Cylinder Tumbler replacement; mixed diesel/gas
http://www.peachparts.com/shopforum/showthread.php?p=1065596#post1065596

Ignition Cylinder, Switch, or Housing?
http://www.peachparts.com/shopforum/showthread.php?t=145832