Filament spool with aluminum bar

Another filament spool but this time with aluminum parts.
Yes, I love the aluminum and use it often for my works.
So I created this project starting from a bar of aluminum 10x10.
My intention was to create a filament spool with a variable diameter to fit the different providers of filament.
I also need to attach the spool to the workbench. So I made the pin with a nut 6MA inside(fig 4 and 8). I really like this idea, although it is not mine, but do not remember where I saw it. Of course anyo