On the pulley that the belt runs over in the corner of the machine there's a small set screw. You'll likely have to move the head a bit so that it spins into view. Loosen that screw and the pulley will be able to spin freely on the rod. Make sure you tighten the screw tightly afterwards.
The black sliding block has a spring inside it that keeps the belt at the correct tension so it wont be a problem.
Which screw are you talking about? Also if the tensions equalize, then won't it no longer be taut along the top?
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