Thank you Horia and Xplode for your answers.
We are a team and have 3 of these focuser motor/drivers installed in remote observatories
@Horia, this is what we were afraid of…pretty clear now
we anticipated a little bit and have started to make a new controler and ascom driver by ourselves. Fortunatelly we have a real maker in our team who can do that.
@Xplode, the mechanical side is fixed now, we we faced an issue on 2 motors : the flexible coupler was sliping, we had to glue it on the focuser shaft. The coupler hole in which the focuser shaft goes is just a little bit too large may be 6mm against 6.35mm or something like that). Now this issue is fixed.
So we may keep the motor installed and upgrade the controler and its ascom driver.
in the meantime, the current usb focus are still running, I am currently autofocusing in Chile, while beein in Paris/France, thanks to SGP, amazing…
We also have a Starizona onto a FT focuser at the same place, which works well.
thank you guys for your fast answer, clear skies