nice micrometer style carriage stop - not sure what it was originally designed to fit, it works well. the stop part is on the hex head just past the micrometer piece. the threads that are external to the casting are corroded (I cleaned them up) as you can see, the threads inside the casting are fine - it works as it sits, you don't need to do anything, just put a nut on the threads to lock it in place if you want. I'll list this on ebay in a few days at $40 or so, but for now, if you want it, it's $25 plus shipping (I save ebay costs and can support folks who might need it). Shipping in the USA will be $5 to $7, overseas it will be (sadly) more than double that.