I am NOT good at describing things so I have attached images, the FINAL belt used to drive the focusser from the Skywatcher unit
http://www.opticalvision.co.uk/astro...o-focuser.html
attached to the actuall scope focusser via home made (as I couldn't find one the right size) belt, from a cut down vacuum cleaner belt
https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1
and shaped cycle inner tube repair kit