How to replace a broken tilt key?

A handy person from Marietta, GA says:
February 27, 2011
How do you replace a broken tilt key on a storm window sash? I tried tapping out the the broken key with a hammer and screwdriver and the frame of the window began to separate. Does the frame have to be disassembled to replace the tilt key?

Similar question for replacing a broken slide bolt. Thanks.
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Paul Sr. from SWISCO responded:
February 28, 2011
Great question, thank you for posting.

Sometimes the corner keys are punched to lock into a frame. You will see indents on the corner. You may have to drill them out to release the corner. However, be careful not to drill through the frame; you're only drilling out the indent.
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