Tacori's Classic Crescent has been reimagined with the signature Tacori crescent sculpted into the metal inner face of each Tacori design. (tacori.com)
With its angled inner faces, the belt can circle the angled pulley faces at varying diameters depending on the pulley width, which alters the effective ratio between the pulleys. (greencarcongress.com)
Second problem (which I solved) is that the oil ring groove is square, and the oil rings I have (2 parts, one the ring, one a coil ring inside) won't work because these needs the oil groove have a concave inner face, to accommodate the spring ring. (mechanics.stackexchange.com)