I wish there was a clever software program to produce mitre templates for complex seat stay mitres. However it only recently occurred to me to reduce the time it takes to shape two by transferring the mitre from the first hand carved one to the second side. I like to do my seat stays in the “fast back” style for preference instead of using top eyes. With very narrow stays it is fairly easy to shape the mitre to the back of the seat tube, but so often the seat stays are 15mm or more in diameter and require quite a lot of shaping to wrap around the back and sides of the seat tube. It never ceases to amaze me how at first it looks like the tubes will never mate, then with perseverance they all at once seem to drop into place. It does however take a lot of patience to avoid over filing the mitres whilst continually offering up the seat stay to the seat tube.