My friend Jerry needed to remove a cylindrical clutch assembly that had been pressed into a recess. The only feature available for grip was the bore of the clutch. He made this puller and was able to extract the clutch.

(photo by J.Drake, used with permission)
The working end of the machined part is three spring fingers that fit the clutch bore. The new idea here (to me) was making the puller a tube so that a drill rod could be pushed in to lock the fingers.
You can see many more details of the puller here.