I have a Japanese Sony TC-8040 Quad8 deck and just had the electronics fixed by my tech. My problem is figuring out which belt to get for it. I used the string method and ordered what seemed right online and got something that fit but looked like a vacuum cleaner belt, i.e. thick and heavy. The consequence is the deck plays way too fast. I stuck an elastic band on and I get much closer to correct speed but with the expected warble. There seems to be no online reference to this model with useful info. With the elastic I get close to speed but warbly and it seems a bit weak. With the belt I bought online the motor is way too fast but the torque is amazing. Does anyone know the correct belt size? Being a Japanese deck I paid attention to buying a 60 cycle version and the motor hub has the 60 cycle attachment. I see no spped adjustment inside and the motor seems to be built to withstand a zombie apocalypse, or a long Quad8 tape but it is not a standard DC motor with a trimpot in the bottom to change the speed.