Mold For Driver Bit Handle

I wanted a pocket-sized, interchangeable bit driver set, but was faced with a dilemma: 'proper' versions are never pocket-sized, and pocket-sized versions are, without exception, crap quality.

So I decided to purchase a high-quality set of bits, plus an extra bit-holder, with the intention of making my own pocket-sized, interchangeable bit driver set.

This 'thing' is a simple mold that allows you to form a solid handle onto an extra bit-holder using a high-density castable (e.g. epox