My neighbor came to me and said he was having a problem with the deck belt coming off the mower. So I helped him remove the deck belt and I noticed that after the belt left the deck it twisted going around the electric clutch pulley but straightened out on the other side. We removed the deck and the belt was routed correctly on the deck but it was damaged pretty bad. we checked all the spindles and pulleys and they all lined up and working properly. He went and bought a new belt and installed it. Made sure deck was leveled right. I stood back and watched as he engaged the deck and the belt immediately jumped off the clutch pulley. Checked info online and could not find much about belt coming off of the electric clutch. Also he replaced the spring with a new one on the tension lever. Husqvarna LGT24K54. Model# 960430127-02. We would appreciate any ideas, thanks.