Arbor was found in a box with other Walker Turner items that I believe came of a model L 1152 , but I’m not 100% sure. The arbor is tapered appearing to be a Morse taper no. 1 with the other end being thread bolt with nut. Bolts actuates down the entire with a slight rough spot near end where nuts meet as fine thread had a slight ding, but worked smoother with a few passes repairing thread interruption. Spun straight when placed in drill Chuck. 5” in total length with thread area being 2 1/4” long. Please see pictures for complete detail of overall quality and features.