Otari NAB Adapters There are several types of Otari NAB adapters, but this article is about this one: These adapters have a rubber belt along the side that is often broken after all thee years. I measured the dimensions of the belt and here it is: width: 7 mm thickness: 1,5 mm folded in half:  ~ 100-105 mm diameter: ~ 64 mm circumference: ~ 200 mm radius: ~ 32 mm Also beware of the 6 (3x2) small pucks that can -and will!- fall out when you remove the rubber belt.