Juki Union Special 35800 Series Feed-Off-The-Arm Lapseamers These feed-off-the-arm machines are the fastest available of this type. All styles are equipped with a wide (.588 inch, 14.9 mm) upper feed roller, driven by a new state-of-the-art belt drive system, which produces less vibration, no puller overthrow or stitch length variations and results in consistently flat seams.