I have found using stainless steel (the hook end on a nail clipper, used for cleaning under fingernails, all I had at hand so thought I would try it) and iron (nails) work really good for removing those dang fingernail catchers. All you got to do is put the point or blade on a hard flat surface, support the back edge to keep it from sliding around, and then press downwards just in from the edge of the fingernail catcher with the flaker, if it doesn’t come off, drop the angle down towards the point more and press in on the edge of the fingernail catcher and wiggle it around while pressing in, that should pop it off.
Also if you have a finished point or blade that was from a slab (1/4 inch plate glass in my case) and notice a little shinny raised spot left from the facture surface in the middle of the point, put the point or blade on a hard flat surface and support the backside with your middle finger, then place the point of the flaker (hook end of the nail clipper in my case) against the edge of the shinny spot, place your index finger over the spot, then press in and lift straight up with the flaker, and the shinny spot should pop off, if it was too big to come off all in one piece just turn the point around and go at it from a different angle, might have to do it a few times to get it to come all off.
Bushman