Norlett Bison rotavator

Dear all I have just purchased a Norlett Bison rotavator I have sorted the engine but I'm having trouble with the 3 belt system does anyone know the sizes or know where I can get a manual. Many thanks Darren

Hi Aunt Sally yes I did check them they are not the right ones apparently the Bison is few and far between so the manuals are as well. I don't really need a manual just need the belt sizes as the pulleys are adjustable so you can't measure them.  Thanks Darren

Yes I thought about that but the belts are not in the best of shape and the long one is wrong cross section and completely shot but the smaller ones aren't to bad so may get away with that. Thanks Darren