Hello Roy,
I have noticed your build and am quite impressed, very nice!
As you seem to look for a way to make swirls in aluminium I may offer some advice:
Swirls like these are often used in watchmaking and called "Perlage". Youtube has a lot of info on how this is done and watchmaking tools should help you in achieving your goal.
I have a couple of special holders for making "Perlage" in a small drill press, it is like a pin-vise that holds a cylindrical piece of polishing rubber, it should be available in different diameters and grits but is for creating small 'swirls'. You should be able to obtain these from places where they sell watchmaking tools.
Do a google search for "Perlage tools" and it should give you sufficient hits. "Boley", "Bergeon" and "Flume" are brands that sell the tools, as they are German/Swiss companies, look for "Stiftpolierer".
I hope this willl help you in your search,
Marc