Hi! This treadle opens with a sliding chain (inside the top part of the cabinet) and pulls up the sewing machine with one smooth movement. This is unlike any other treadle I've seen where you simply open the top and pull up the machine. Is this feature unique to the Raymond Treadle and does this make the treadle more rare? I just bought it for Cd 150 and it is tiger oak and the cabinet is round with 2 drawers on each side. Thank you, Truffles