Hi all, I have a 706 Farmall Diesel that wouldn't stay in Hi, low, or reverse. About 25 years ago it did the same thing and I found the spring held dog under the cover of the range section broken. It was a simple fix, I pulled the top put in a new part assembled and went on my happy way for about 24 years. This spring I took it apart again, and same arm broken on the end. We bought the part new and reassembled and cannot move the shifter lever. We've had it apart several more times, and still cannot move the lever when assembled. Would any of you have any suggestions on what I have done wr