the belt that goes on the variable speed pulley an takes up two other pulleys under where the battery goes, i have bought a new orignal belt not the cheap ones, yet it eats ut up in under 4 time im talking when i get the belt its nice an thick an when it dosent drive anymore i look at it an it thin an the mower wont drive anywhere till i replace it. an it gets expensive can anyine tell me why this happens so fast ty