nozzle holder

i am new to designing and needed a nozzle holder. I wanted to do threads but when i tried the M6 threads it came out to small and i couldn't get tolerances right so I tried M7 threads and they works really well with my M6 nozzles. i added the f3d file for bottom so if you use fusion you can change size of hole and threads. i tried to put f3d file for top but for some reason it wouldn't download.