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I  guess riju didn't need one that badly.

Thanks for getting back to me.  I am away from the workshop at the moment but I will do this test as soon as I return. 
Since my post I have adopted the default eeprom address 10.10.10.10  I have also set the PC to 10.10.10.11

If I type
mesaflash --addr 10.10.10.10 --device=ETHER --readhmid
The result is
Unsupported ethernet device 7i97T at 10.10.10.10

Thanks for your help

Wait is your big one set up as a 2.4 or a Trident? Eventually I am looking to build a 2.4 version with a 600mm cubed
work envelope (or bigger). Just not this round. LOL

Well, I had a good look and compared it to NoJo's config but I'm afraid I can't wrap my head around the problem.
If i understand spindle synchronized motion correctly then it really only depends on the encoder signals connected to the 'spindle.0.' pins.
I think the most likely way figure this out is to diagnose things with hal scope on the machine and find out what is happening to the index-enable signal and z-axis motion.
I'd love to help more but I have no hardware to test any of this.