He's a Dutch collector who makes and sells reproduction backglasses with true mirror lines. He will ship to the USA. He also sells other small cabinet hardware parts.

http://www.coos.net/bingo_e/index.html

Edit: I believe he also sells stencil sets for cabinet art.

Sounds like Dennis has you covered with his offer of replacement springs, but I'll still throw this out: I use crushed walnut media and add to it Flitz, the tumbling additive. 24 hours of that does a basic cleaning and oxidation removal. I finish off with Mother's Mag and Aluminum polish carefully applied by hand. It takes time, but the springs look very good. You can use a Q-tip and Mother's around the attachment points on the posts. I believe you also could use a Dremel tool with a felt tip to apply the Mother's, but I'd be careful around the curly areas at the posts or just do them by hand.

No need to coat the spring with Flitz. I start my tumbler and then add the Flitz. Just squirt it in various areas so it gets distributed more or less evenly. Once you've added the Flitz in the ratio recommended on the label, stop the tumbler after a minute or so and put the lid back on and the parts in. I'm pulling this from memory, but I believe the label suggests 1 oz. per pound of media.