Hello. I'm new here, but I was thinking of getting a new sewing machine to mend clothes, make adjustments in sizes and make new things from scraps of fabrics, when I remembered my dad has a sewing machine which he has had since the 70s. The only problem is that when I tried to use it I realised there was an issue with the timing belt. I'm wondering how to repair it, or whether it's worth finding somewhere that would repair it for me. The instructions I've read seem very complicated. Does anyone know if it is a big job or if I can do it myself?