How do you remove the tumblers from an ignition switch?

["Patrick J. Horne" <horne@cs.utexas.edu>]

I am getting ready to have my ignition lock/switch overhauled and I 
don't see how to pull the lock out.  This is on a 67.5.

Thanks,
Pat

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Pat Horne, Network Manager, Shop Supervisor, Future planner
CS Dept, University of Texas, Austin, Tx. 78712 USA 
voice (512)471-9730, fax (512)471-8885, horne@cs.utexas.edu