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Still to come. The slots are coming when I can replace the vice. I have the rotary table on the mill with the first of the drive wheels still mounted. This is as far as I managed to get with out moving heavy objects. I am thinking of making mine like the patent drawing with the chain on the outside and four small wheels. The plates don't have the internal groove for the idler wheels yet, waiting to make the idlers to see how they fit. You said impressive I prefer to think massive. My work is not impressive. Out of curiosity I just weighed the track plate each one weighs just over 4 ounces. The sprocket blank weighs in at almost 4 pounds. That is a lot of metal to remove.