Denny---tell me more about this short yoke/long yoke business---maybe these 2 yokes aren't as identical as I thought. The one in the picture is the one I used to insert into the tailstock to measure for my driveshaft, exactly as per your drawing.---the one on the driveshaft looked the same but I never actually compared the length of the machined surface between it and the one I measured with.---in fact I didn't know they came in different lengths.