For you guys running a 4lbs lower Metco pulley, what idler pulley (that sits beside the Metco crank pulley) are you using? 90MM or 100MM? I've got the 4lbs lower, with the 100mm Metco idler pulley beside it, and they almost touch each other. Hard to slide the belt in between the 4lbs pulley, and the 100mm pulley as well.