How do remove the broken one hole lock?

A quick learner from Spring, TX says:
How do you install the 90-026 in place of the broken ones already there? The current ones are not installed with screws.
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Paul Sr. from SWISCO responded:
If the lock is not screwed on, it is most likely riveted on. If this is the case, you must be extremely careful to not break the glass when removing the broken lock. Using very sharp drill bit and slow speed drill, carefully drill out the old rivet to remove the broken lock. Be sure to take safety precautions such as protective gloves and safety glasses.
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