If you're going to make tap wrenches for small taps, you're well advised to incorporate a guide pin into the design. Without one, it's just too easy to bend the delicate tap and snap it. In my article on the subject...
Tap holders
I point out that, at least here in the USA, the tiny taps have the same size shank, and so a single hole and a setscrew is all that's needed to secure them. For odd size shanks, I show several other designs including one with collets of a sort.

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