Has anyone used the brake bias bar set up from Locost? If so how does it work?

I havn't seen one to copy yet but have the pedal box, from a Reliant (not the Scimitar the other one but don't let on!). It looks the same as Locosts so it will be adaptable once I know the principal of it's mechanics.

I can see from pictures that it uses a threaded bar between the two M/Cs push rods to adjust the amount of force applied to each M/C. But this is at right angles to both push rods and not as I would have expected, in line with the foot pedal pivot and M/C push rod.

A photo or web page link with a photo of one would be great.