Isel GFM 4433 ballnut preload

Hello, does anybody know how to preload ballnut for isel machine, some online sources says can be ajusted, so seems longest screw (Y axis by isel X) has bolt to squish, but cant see anything on others axis as they build in aluminium extrusion, thank you in advance.

Hi Buckis

This might help
https://www.cnc.info.pl/download/file.php?id=1211
It's in German I think there should be a grub screw to adjust although they don't really make it clear in the description.
Cheers
Andrew