Spindle about 1/2", fire board about the same 1/2". I have gotten both sqeaky and raspy sounds, it's good to know raspy is good. Thanks for the additional info.
Squeaky is bad. It means your spindle has glazed over and won't provide friction needed to make a coal. A quick fix is to drop a couple of grains of sand in there and that might rough up the spindle enough. But you may just have to rough it up a little with your knife.
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