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I recall some development tests that were conducted at Saginaw Steering Gear on the prototype locking steering columns. I think that the locking bolt will actually cam out of the locking plate if you apply extraordinary leverage on the steering wheel. The camming effort was so large that no one would be able to drive the car because the locking bolt would be inserting into and camming out of the locking plate every 30 degrees. I do not recall the actual camming force.
During the development phases I am quite sure that the steering column wasn't damaged when they performed this test. However, they never tried the test on a 45 year old steering column. I personally wouldn't try the test on my own locking steering column.