I found working on G&G and TM if you are trying to put a M120 or higher into it you will need to grow a third hand or in your case a very understanding wife when you ask her to put her hand in your gearbox without bring her some flowers first
I did come up with a fix and a tool to get this all to work in the end. I would ask haircut at first to hold the parts in place but he would be distracted with his bloody phone in his othe hand and would move the parts that he was in charge of





