There's a spring on each side (inside) of the catcher bin,the one on the left is missing. I can't find the part number listed or shown in any of the Walker part diagrams. My mower is the MT26 model.
Thanks for your reply, it's a 2012. I will have to go by the dealer and have him order it ,can't find the part number. Here is a photo of the remaining spring on other side.