I have an MTD yard machines rear tine tiller, model 410 that was coming out of gear when the tines were engaged. When searching for an answer to the problem I discovered a solution that was posted for the exact same problem. To say the least I was overjoyed, since the solution included information that I would never have figured out simply by trial and error. A little over a year or so ago, one of the online experts who goes by ehertig_cwc posted a pic of a bent shift fork, and explained that not only replacing the fork with a newer, redesigned type, but also replacing the detent ball and spring, was the solution to the problem. I was overjoyed, until after re assembling, and testing the machine, it only worked for a minute before popping out of gear just as before. By the way, I had to pay nearly 90 dollars just for the shift fork, and the ball and spring. (ouch). Can you tell me what might still be the problem with the transmission?