That is a good repair, in fact I had considered it on my TD18 and still have the pipe halves somewhere to prove it........a couple things didn't work to my advantage though........the rails were stretched to 125% and I think the sprocket would have had to grow substancially in diameter for it to work.......hey somebody got all their money out of that U/C just too bad it wasn't me........LOL
I think the liners are still available, pigeon products sticks in me hed for some reason :Banghead..........maybe I'll google abit.
I would think those will wear in quite nice and probably last awhile, after tacking the center up did you must have massaged the edges outward?????
I was even thinking of using weldable rebar as the tip as the edges get abit thick.........