Ammonium thiosulfate teaspoon amount for TF-3?

I have ammonium thiosulfate (anhydrous?) crystals, and I want to make TF-3 Alkaline Rapid Fixer. The recipe calls for a 57-60% solution of amm. thio. which I believe I would make by adding 57-60g to a liter of water. But I don't have a scale, and the metric/teaspoon conversion isn't listed in THE COOKBOOK. So does anyone know how many grams equal one teaspoon? Also, has anyone successfully modified the recipe to lessen the ammonium

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