Originally Posted by
Fredo76
The only tricky part of hacksaw and file method for me was the other end of the top tube - if not approached carefully it can end up too short. Rumors were rife during the seventies bike boom that some manufacturers skipped the filing step, or just roughed it out.
You have to start with it a little bit too long and sneak up on it. I guess if you were jigging everything super-accurately you'd do this with the DT as well. But I cut the DT to what it's supposed to be as close as I can measure it and then fit the TT into the space available with the DT in position and ST and HT at the correct angles.