Originally Posted by
SurferRosa
With a string and a metric ruler.
Uh, yeah.
Why wouldn't they be? You can make a simple tool with a threaded bolt, some nuts and washers.
Some make this out to be like it's some huge project. They say the same about building up a simple wheel. It's not rocket science.
can be done with basic equipment but not 2x4 easy. Unless you are correct in the assumption that the frame is straight and true, seat tube not bowed. One has to understand the limits of the tolerance stack you have accepted.
I would never respace a frame without H tools.
a frame with a braze on front derailleur mount- just a situation asking to distort the tube.
Not a lot in general but 20mm of one side of the tube is being heated up to brazing temp and the other side not? Held between two points? There will be some movement.
what Mr Fattic is basically stating, know what you have in reference to a strong, reliable datum. So all can be reviewed before and after.