Les
Regrettably little I fear.
Fundamentally a collectors item, if there are folk that collect such things, because it's a functionally poor design and not actually that useful. The base moves freely once you release the toolholders and setting tools to height is even more of a faff than shimming with screws both underneath and on top to adjust. If you fit two toolholders they both face the same way so getting in the way of the job is almost certain.
One has to wonder what sort of wacky baccy the designer was putting in his pipe and what Burned management were using for sugar in their tea. I reckon they'd have done a darn sight better selling a system based pin a fixed, indexing base with two slot blocks to go on top.
Clive