This adapter came with the lathe. As indicated in the thread, every incorrectly made part clearly was assembled by the Chinese manufacture and exported this special through Grizzly. I have thought of making a new sleeve, I still need to accurately measure the spindle taper just to get something close. I'm retired, and probably will never need anything to fit this spindle hole but a true running center. I can't live with the 5 thou of runout. I've had the lathe since 2004, and just now finding the issue. Most work is always held in 3 or 4 jaw 12 inch chucks.