Like biketeacherdave said above. I have a sandblaster tool. 20 quid. I use sand in bucket and it is quite easy to do it yourself. Use mask and safety glasses. If you want to shot blast aluminium. Use baking soda power. Then spray high heat temp paint on the calibers then clear lacquer.

Cheers, Taffy. I sent the calipers to get blasted and painted last friday. I'll look in to that in future though.