Have you got yourself a tumbler yet Rob? Good for cleaning pop bumper parts (metal).
No gotta get one I suppose. Nearer to th etime I'll get in touch and find out what you have and where to get it. The bonus also is that I can leave it running outside at night and piss one my nasty neighbour off. She has even complained once that my pinball made too much noise when the ball hit the pop bumpers.