The T2009 manual to download in case you don't have it is here -
https://www.teamxray.com/teamxray/sh...p?file_id=4904
See page 12 for how to adjust belt tension, you will also be able to get the correct part numbers for the belts you need, they should still be available to buy from the UK Xray distributor -
www.rcdisco.com
Hope this helps