Simple tool make over. These handles are on certain import xy tables. It is a fairly well made table but these knobs have bothered me for years. They still make these tables with knobs that have scallops inside them. They always grab a finger nail or two so I did what must be done. Remove them. Now they are nice and smooth, no more biting. The handles are just cast iron and they have a round hub on the back side. Just chuck it up and cut out the scallops for a more friendly handle.
Here is what mine looks like after the removal.