From my limited understanding these are Riveted in with 2 rivets. I have purchased two extractors. Just in case one breaks. But I can't seem to locate any rivets. Can the old ones be reused ? It seems to me the answer would be no. But I am not sure how they work. I am assuming like the old brake shoes on a big truck. And how do they install ? Is there a specialty tool needed ? I am going to take this to a local gunsmith once parts arrive. But I want to be sure to have all the parts needed before doing so. Any help is greatly appreciated. This is a 222 Rem Mag. I am not sure the original is broke. But may be once the cartridge is removed from the bolt. If it doesn't I will have 2 extra extractors & still have a need for rivets I assume.