An eyeglass repair kit may have a flat screwdriver that would work.Well, so far I prefer the M. Keep in mind that I prefer a less airy draw, so I have the AFC all the way closed.And, I'm still waiting on my tiny screwdriver from fasttech, so I haven't adjusted the AF on the original from the way it came. I think I will be able to better pick a favorite once I am able to play with the AF on the original.