ANYCUBIC Kossel Filament Roller via Turntable/Lazy Susan

To save some space around my printer I bought a cheap 30cm(12") turntable (lazy susan) and placed it on top of my delta frame (Anycubic Kossel Linear Plus). I designed these parts to hold the turntable in place.

I bought the turntable "AsiaLONG 360⁰ drehbar Universeller Drehteller 30cm" on amazon.de, unfortunately it is no longer available, but this should also work with other turntables.

My turntable has an outer diameter of 305.5mm (not 12" or 30cm as stated in the product description...