I recently acquired my first lathe (Logan 200) and am really enjoying learning to use it. It came with many attachments and accessories--original 3-jaw and 4-jaw, face-plate, new Bison 6 1/4 3-jaw, new tool-post holder and a new tail-stock chuck plus misc other tooling. Lathe holds nice tolerances and shows minimal wear. Also, there seems to be two different collet holders that I will probably never use. There is also one other attachment that puzzles me. Maybe someone in the know can help me identify what it is used for?? Please see photos.