RE: Polishing an aluminum spinner
They look great, when polished.
I do mine on a buffing machine, like grosbeak's ...only takes a few minutes ... costs next-to-nowt, just a bit of polishing compound.
You can find manky spinners at swap-meets. Blokes sell them cheap, 'cos they look so dull.
But, with the magic of electricity and the cotton buffing-wheel ...