Janome Twin Dual Feed Quilt Piecing 1/4 Foot OD (Cat D). One of the interchangeable feet for the AcuFeed Flex Twin holder, the 1/4" foot OD, sometimes referred to as the Quilt Piecing foot, is a quilters dream. It has a built-in flange to keep your seams right at 1/4" all the way around. Clips onto dual Acufeed foot holder which comes with your machine. For Janome Top Loaders Category D.