That looks like the slip in not the bolt in, right? I think I need one of those to replace the straight one in the wagon. How did you get the handle out?
To answer your question, there is a little tab in the shiter mechanism the slips into a grove in the handle and locks it in place. To release it you just need to slip a feeler gauge between the shifter and the handle to release the tab from the grove than you can just pull it out. 8)
