If it has gaps so you can get small flat blade screwdriver on the inside of it, pry it off that way.
Usually hold one end of it with my fingernail to keep it from turning and free it from the opposite end.
If it doesn't have gaps to get a screwdriver behind, I hold one end of the "C" with my fingernail and push the other end with a tiny flat blade screwdriver.
I've never ruined one....temporarily lost a few when they went flying.
Been pretty lucky lately. Maybe 'cause I've been dealing with Japanese sticks.
I've never dealt with old leaf sticks. I imagine they had beefier e-clips and a tougher method might be needed.