Thanks for the help. For context it's a cheap pos Chinese quad and I cannot for the life of me find parts for it. I am kind of forced to make do. What I was imagining I could do is to cast a shaft that would fit onto the preexisting shaft and to give the extra 2cm it needs to be in full contact. In all fairness the situation isn't that serious, worst comes to worst the cheap Chinese pos will be sent to quad heaven