I havent seen any tools out there other than the G5. What it does is that it insures that after your arrow shaft is cut it is perfectly square, so as long as your insert and nock are sqaure it will fit without having any wobble when spin tested. The really nice thing about it is that you can sqaure the front of your inserts also. So when you get your fully assembled arrow with a broadhead and it wobbles when you spin test it, you can hit the insert with the ASD tool and it usualy takes care of it unless you have a bad head. If that is the case then there isnt much you can do. You can ask anyone on here, it is pretty hard to get consistant flight from a broadhead tipped arrow if it wobbles alot when you spin test it.