I posted a thread on my 10304 having issues with the rear wheels sticking while pulling it backwards. since then I replaced the clutch and rocker keys in the rear axles and replaced the belt. it still acts up. I operated it with the belt cover off and I found the belt still wants to spin the pulley with the handle released (and yes its adjusted to fully release the tension) causing the clutches to engage hence locking the rear wheels. the belt is 33inch but aftermarket. could this be the issue or is this a design flaw that needs modification to correct?