Hi new to this forum. I just ordered a replacement double deck pulley for my mower. Ordered the same part # that is in the manual but the new one has a larger pulley at the one end than the other. Original had both pulleys the same size. Now with new belts I have squealing and slipping of the belt in the larger pulley. Any suggestions on how to fix. Wider belt of the same length for the larger pulley??? Thank You in advance for any replies.