If you have some serving thread you can serve in a nock point rather than using the brass nockset. I haven't used a brass nockset in 10 years. If you do decide to do it, there are specially made nockset pliers with a wedge on the end that are perfect for taking off old nocksets but you really can't justify the expense unless you're doing it a lot. I'm with Paul that it's worth it just to get a new nockset rather than trying to re-use an old damaged one.