I was surprised that they work very well considering they are basically little plastic spools. They work well with old metal tools that need polishing. And that's the problem, basically they're just little plastic spirals. This whole set shouldn't cost $20, it should cost $10 or less. You need to get rid of a fishing tackle style box that is really too big for what it contains. Place all slices in a pair of clear tubes. Put the shafts, bolts, and lots of those little red washers in the third tube. This should reduce costs significantly and allow for smaller, lighter packaging to be shipped, allowing the price to be kept down.
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