backplate

I have one of these: https://www.axminster.co.uk/axminster-clubman-sk100-woodturning-chuck-ax915228 and I need to fit it on a mini lathe with a 80mm backplate I have a DXF and a sketch diagram of what I need more or less: can someone make one for me ? :D

I have this ancient three jaw scroll Chuck with no real markings on it. I tried to use it and the run out was absolutely terrible it was actually visible. It measured on the order of 7 thousands. It came with it lathe parts that I purchased and I didn't really inspect it before I threaded it on...

Hi everyone, i just bough an old lathe, i guess it should be around 1950 manufactured, and i cannot figure out the threads on the spindle. I need to make a new back plate for my new chuck but i don't have the treading gears so i need to identify them so i could machine 2 back plates(the boss...