One of the real backgrounds for the Team meeting was to solve the issue of having 4 lens heads for focusing adapter and only three adapters ... All of which should work with modern cameras and hence had to provide CPU support.
We decided on combining the adapter for my 400/4.5 and 600/5.6 lens heads into a single unit with an external CPU selector switch. Thus, Erik would retain a 600/5.6 lens head with the second CU unit, and I would keep the more sturdy AU-1 adapter for my 800/8 ED lens head.
Basically the solution involved the drilling of a hole into the CU casing for the switch, soldering separate CPUs onto a 2-way switch, and putting the entire contraption into the CU unit itself.
Here are illustrations to show Erik's progress with said project. Seems so easy when Erik is at work on these matters.