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They do manufacture 12 sided ER32 Collet Blocks ( Refer eBay item number:164033474721) But I made my own.

In Aus try TEA transmissions TEA.net.au for all things gears etc.

Hi Jinxy, Looking at the manual you need to loosen both the locking nut (in the curved slot) and the nut holding the gears C & B . The locking nut should allow the whole pack to swing down and the Tee bolt holding B & C should then be able to slide to accommodate the different gear sizes.

The photo looks a lot like ones I had as a boy from a book called The Boy Mechanic. First published in 1913, the one I have is the New and Revised edition published in 1960. It was published by Popular Mechanics.