Looks good, works good, i didn't face any problems with the installation, i made myself the back plate, 5mm thickness. I made a double plate, the inner plate Φ7,2cm (needs to make the edge little conical to fit! Important!) helped me to center the chuck on the main plate, i made a paper gasket to copy the mounting holes position , i drilled the holes and everything perfect.
It took one or two days more than the expected to arrive but that's ok, everything fine.
I feel very satisfied with the price , the quality and Vevor Service.