When you push the silver rod in, do you feel a spring fighting you? I might try pushing the rod in and rolling the gear in the take-up spool area by hand. What happens is that the silver rod and part connects to a plate on which a gear sits (6D-106 reverse lever on Yashica's diagram) When the rod is pushed in, this gear is pushed into contact with the film feeding disk's small gear on the opposite end of the shaft (6D-113-2 on Yahsica's diagrams). So you should be able to feel things changing... Of course, the spring holding the silver rod out is strong and coordinting all of this isn't easy. this is where opening the side makes it all so easy on a D- it's all right there in front of you.