Back in my dueling and spinning days, 90% of my sabers had a Graflex clamp on them (Luke ROTJ and Obi ANH hilts). I NEVER had an issue with them, no matter what others "experts" at the time said. It truly depends on the person, not the saber. I shut a lot of people up with my test videos on this matter.
If you care about "accuracy" just live with it. It's not that hard to learn how to use a hilt with a Graflex clamp on it. The OG members here who know me can attest that I know what I am talking about.
If you don't care at all about accuracy, then by all means ditch the box, lol.