If the nocks broken I've found the best way is to get an old Allen key, heat it up and push it into the nock. Wait till it cools down then use some pliers and just pull it out
That didnt make me feel very stupidErmm... grasp between thumb and forefinger and pull (unless they're firmly glued in, in which case... good luck!)
It must be going out with a dental nurse, but I always get told off for doing anything other than masticating with my teeth, lol.G Nocks should not be that hard to get out. In emergencies on the field without tools you gently grip them with your teeth twist and pull. Never had one that wont come out.