My 2005 Husqvarna Snowblower 10530SBE Impeller/auger Belt has been slipping for the last three seasons .I have extended idler adjustment to it's limit s and I have replaced the impeller belt twice. Still have the problem so as an interim fix I placed five wrappings of duct tape around idler arm pulley and the impeller now throws snow a good 30 to 40 feet. think the pulley need to be of a slightly larger diameter? Any thoughts?