so what was the origional problem there 007 , those wheels look new too they aftermarket ? you sure they mesh with gears correctly, and couldnt make out a spring on the tensioner does it have one or just hard to make it out blush old eyes. did you add grease to the 'box might have been too much now clutch is slipping .

a tad hard really need to know what went wrong at 1st , whats been done , why its doing it now or if its different to before

cheers