If this is a vehicle ignition, keep in mind that the lock cylinder the key is inserted into isn't actually the switch. When you turn the key, you're actuating a rack/sector assembly that moves a linkage rod. The rod is attached to the actual ignition switch which is located on the upper side of the steering column way down under the dashboard.
Anything binding anywhere along the way can cause stiffness, (for instance the rack/sector teeth, or the surface the rack sector slides back and forth on).
As long as you have a working key, the lock cylinder itself is easy and cheap to change out if it's causing the sticking, but I'd be more suspicious of the other bits involved. (The markings in red on this drawing don't illustrate anything I was trying to point out...they were already on the drawing that I cut & pasted from another site.)
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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