I, too have a chipper shredder for preparing compost. My blades are the soft steel style, but it does the job. The only thing, I have always understood that you need to stay away from putting animal parts into compost. I'm not completely sure why except it may have disease causing properties or attract varmints or something. Maybe if the compost cooks hot enough you don't need to worry. Compost does help good tomatoes grow gooder.
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