I know it’s super lazy, but I dislike taking the shields off of bearings. I try needles, safety pins, exaxto knives, and etc…,but I always have trouble taking off shields.
Videos I’ve watched, the just come off for other people really easily. Lol
C Clips have an angled cut on both sides.
On angles out and one angles in.
You might be trying to get under the side that has the angle going in the wrong direction.
If that is the case there will be very little for the pin or whatever to grab.
I realize this doesn’t answer your question, but: I find that an actual sewing needle (not a pin) does a good job because the tip is sharpened much more than a typical pin. However, they dull quickly.