thiel/walter rotary table backlash

Hello

I have a RT380 rotary table for the thiel 158
I think its a walter, but its different than standard by having the handle on the right side.

Does someone know if its possible to adjust backlash? Ive tried all the screws and turned the discs but backlash is still 2-3mm.

I do light cuts in aluminium and the whole table ocillates when i try to use it.

Any advice?