That can tough,the brass inserts are quite a bit longer then the standard aluminum inserts.I have removed aluminum inserts by very carefully drilling them out,they are alot softer then the brass inserts.You might try this method,remove the nock and find a steel rod or drill bit that just fits inside of the shaft and whip it towards the floor and it may drive out the insert.It's just the HIT inserts fit down inside the shaft deeper then regular carbons and the brass insert being longer it has more glue surface.If that doesn't work you can always cut from the nock and and refletch your arrows.Feathers don't cost as much as the shafts,you might have to scarfice them.