Qualtex VBT04 was the small ‘V’ belt for the spin can drive. Shows as obsolete, I’m afraid. 🙁
Try your local bearing supplier – they supply sectional ‘V’ belt kits that you can connect together to suit the application. (often used to make up belts for lathes, compressors and milling machines). Worth a go, Jim!! 😉
connect say they have the genuine one in stock 5031680388381 £1
or pattern blt103 £1.10
didn`t think the genuine one was available let alone cheaper than pattern but hey thats connect for you