It's odd you mention that. I bought one yesterday for my Leathermans. It was 4.49 and the only one they had.If you have home depot near you they sell a really nice all in one torx driver that surprisingly is made well and is properly sized (rare for cheap torx) for $5 or $6. At least that way if you do sell it you can sell it properly adjusted.
I didn't realize me ZT566 needed Allen heads. The torx bits worked enough to move the clip but I was scared to death of stripping it out.
