Make your own movement trays that are magnetized and will work as a base adapter, all at the same time.
Learn how to print and build your individual magnetized movement trays in this video: https://www.youtube.com/watch?v=Y5QYyqhFMZM
Convert your old bases to the new "The Old World" sizes by using this magnetizable movement tray.
Includes files to update base sizes from 20mm to 25 mm, 25mm to 30mm and 25mm to 30mm (cavalry bases), while creating a magnetizable movement tray at the same time.