Can you please IM me the link to your write up? Perhaps I can look into building one in the spring.I had a whole write up on the BYC forum on how I built that cement mixer compost sifter. It was not very hard. I took the main idea from a YouTube video but, IMHO, improved it by using a system of turnbuckles and eye bolts instead of drilling holes into the cement barrel to attach the compost sifter barrel. If I ever want to convert it back to a cement mixer, all I have to do is remove the eye bolts and put the original bolts back on the mixer. No holes in the cement mixer barrel to worry about.
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When I built my cement mixer compost sifter, I had to buy a brand new cement mixer. That was the major cost. I would strongly recommend getting a used cement mixer to save lots of money. After over a year of looking for a used cement mixer, I gave up and just bought my mixer, brand new, on sale, for a little less than $200. In the end, I probably invested almost $250.00 in that project.
Having said that, I estimated I sifted out finished chicken run compost at the rate of about $60.00 per hour - if I bought bags of compost at the big box store. I covered my costs on that cement mixer compost sifter in about 4 hours. Payback period was just one afternoon!
Every year I sift out hundreds of dollars of finished chicken run compost for my raised beds. Best thing is that I don't trash out my back in the process. I'm at that age where I do just about everything I can to protect my back. I remember the days when I used a 2X4 frame and wire cloth to manually sift out compost. Like you said, it takes a very long time and your back takes a beating. I finally got to a point where I had too much chicken run compost to sift manually. And I'm too old for hard labor like that.