cool, i had a look at the manual, as far as i can tell, the octagon thing is equal lengths on each side, so my theory is now i could mount it in 8 different positions and use the internal offset circle to get the tension correct, my reason for the original question is im running 36 tooth pulleys and wasnt totally happy with the amount of tension i was getting even with the offset inner circle set to full tension, so i'd wondered if i could use the hex thing as well, im thinking i'll turn it 45 degrees, so the diff will sit low still, but further away from the cntre shaft to give me the tension i need, thanks for the help boys
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