Any SEIKO LSC-8B-2 specialists here? in Leather Sewing Machines Posted June 14, 2021 · Report reply 12 hours ago, SARK9 said: The Mitsubishi CU-865-22 is a very similar (Japan made) machine, and its arm assembly seems to be copied from the "old casting" Pfaff 335 mechanically. There are quite a few clones of this very popular small cylinder arm machine out in the wild. I have used a couple of the generic 335 -style synchro arm covers (sold on Ebay & elsewhere), and they seem to fit fairly well. To change from a fixed arm cover to the synchro, you do have to replace the needle plate, feed dog, and presser feet to allow the parts to mount in the correct proximity for the binder to do an acceptable job. The photo you show with a "flatbed attachment" doesn't have the pivot point "axle" for the synchro arm cover to swing from, but that may be removable on the Seiko models. On my Mistubishi, when I change from a synchro arm cover to a stationary plate, I use a DIY version that has a relief milled in the underside to allow the feed dog driving arm to move back-and-forth normally, yet has no open hole in the upper surface to snag some of the odd work pieces I make sometimes. The pivot point in the arms I use still have the hole for the spring loaded retainer, which I use for mounting and locating aids. I've made up several fixture plates with different configurations to allow experimental setups for different guides and binders.....mostly I adapt the "double fold" binders to my machine because the color choices for tape or webbing are pretty limited. -DC Impressive! One day, I hope to be as confident as you and be able to make my own DIY arm cover plates. 4 hours ago, LindanHotAir said: There is a video of a vibrating binder posted by Robert Collier to the FB Vintage Industrial Sewing Machine group. It is driven by a pin that drops into a hole in the feed dogs. Thanks, I will check this out!