I've done it several times, but it's been YEARS since I did....what's the best/appropriate way to change a bar tip? Seems I drove the rivets out with a punch once, and I have drilled them out. Is either "acceptable"? I bought a Granberg mill and accidentally clamped the nose piece too close to the tip, which wrecked the bearings. I happened to have a replacement tip laying around from years ago, and need to get them swapped out.