Hi Andy,
Welcome to the forum.
You have got your work cut out there, that mechanism needs fully striping down and rebuilding.
If you let us know what country you live in we can point you in the right direction to purchase a manual. You will need one in order to undertake all the mechanism adjustments when you start rebuilding it.
You will need to check all the parts for wear and replace them when needed, I can see that some of the wire dividers on the basket/carousel are bent, take care to get these right.
Regards
Alan
Alan Hood
ami-man
UK