Oh wow, it seems to be since Greenfield ceased as a company the stores are not wanting to have anything to do with them, hearing similar stories from a few now.
Changing the belt is quite a simple process, should only take 20mins, if that, if you know what you are doing. but I won't get into that now.
Unfortunately when the drive is sticking like that it is a fairly major job to fix, it requires the drive clutch assembly to be removed, stripped and cleaned, as usually if they are over greased they get sticky like that. Potentially also could be a broken spring, but means the same, needs to be pulled out stripped and inspected.
Again not a huge job for someone that knows what they are doing. I would offer to help but I am about 6hrs away
