spline rebuild

I have a '00 1150GS with 49K miles that has been a great bike since I got it in 2004 with 5900 miles. I do regular service on it, including changing the transmission oil (80-90 synthetic) and the final drive (80-90 dino) with every oil/filter change. There have been no bad symptoms other than...

Has anyone seen how a FD spine is rebuilt? I'm curious about jigs/tools involved. I know its not for the faint of heart. I've seen splines rebuilt (the end product) by 3 different machinists so far, all did great work. Hansen's in particular did the cleanest that I've seen, but none were really...