Had to modify the S180T mounting system.
The grub screws press on a thin metal plate inside the rubber to spread the load across the screen, but the plates walk when the screws get a bit of load on them.
I found some 2.5mm alloy from an old dash mount I made for the Nordwest and countersunk some 5mm depressions where the screws touch so they stay captive on the plate.
It even works!
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