I have what I think are Monarch10EE D1-3 5C Step chucks. I have a 3" and a 5". I also have a D1-3 to Hardinge 2-3/16" -10 adaptor but it is too short with the step chuck screwed on it. The Monarch step chucks are about 3-1/2" total length, and the other adaptor is 3" total length. I have an...