On my L118 lawn tractor (42-inch twin blade), the blades turn under engine power while disengaged. There seems to be plenty of slack in the belt, and it work fine while engaged. I'm running the deck at a medium height to keep the drive and blade pulleys as parallel as possible.
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#3
StarTech
And even be a slightly bent double stack engine pulley but make sure the spindle brakes are good and working