Originally Posted by
philbob57
And I still don't see how it guarantees that you're only changing the side you want to change....
It doesn't. Most frames will bend fine doing it that way, but some will have one stay "softer" than the other, and it will move first and with less force, and it will be obvious, and yes, gotta check against the rest of the diamond, but again, most times it will be ok after bending (I mean setting), if it started out ok to begin with.