Hi, I have had a number of small aluminium panels cut for a music synthesiser I am making, and would like some advice on how to finish them. They are all 2mm thick aluminium, roughly 5 inches long and an inch wide with holes cut in them for potentiometers. They were cut by laser, and have some surface marks both from the cutting and specks of aluminium rubbing against them when they were in transit. I would like to have these panels anodised, but they need preparing before I can do this. So to my question: I have been hand-finishing each panel, but this very slow, and it has been suggested to me that they could be finished using a tumbler. Is this a practical option to both de-burr and remove the surface scratches, while giving a polished surface that would look good after anodising? If this is practical, can anyone suggest a company that could do this at reasonable cost, preferably in the Cambridge, UK area? Thanks in advance of any advice you may be able to give, Phil.