the belt of my TT Beogram 3000 (70’S model) is loose. I ordered one on a website that offers new identical copies but it is too short 655mm instead of 690mm for the old one and the round cross section is larger 2.9mm instead of 2.5mm. Of course mine is loose but the difference seems too important to me. If you owned this TT can you check the dimensions of the belt to confirm the correct ones ?