Schacht’s hand bobbin winders can accommodate a variety of different winding needs. As referenced on the Schacht site:
“Our hand bobbin winders are available in single-end and double-end models. The single-end winder has a tapered shaft that will accommodate bobbins up to 6″ long. The double-end winders can be used for bobbins, pirns, and large-flanged spools up to 9″ long and 5-1/2″ in diameter. On both models, a clamp is incorporated into the base; they are belt-driven with self-lubricating bronze bearings.
Our electric bobbin winder is double-ended and will accommodate bobbins, spools, and pirns up to 9″ long and with flanges up to 4″ in diameter. An electric winder saves time, especially when there’s a lot of winding to do. The speed of the winder is controlled by a foot-powered rheostat like that of a sewing machine.
Our lace winders are the same as our double-end hand and electric winders, except that their tips hold a lace or tapestry bobbin instead of a shuttle bobbin. The lace winder is available only in double-end hand and electric models. If you already have a double-end winder, you can purchase lace tips separately. (The single-end hand winder cannot be converted to wind lace or tapestry bobbins.)”