is there no way of retaining the 3 piece setup. if you could somehow shorten the 3rd solid bit and have the end resplined im sure it could be done. well thats an option i am going to look into as to me the 3rd piece looks to be a solid bar from what i can tell.
let us know how you get on tho as i will be looking for shafts soonish for the mtx! lol