ORIGINAL: allanflowers
daRock, the arm lengths (front to back) don't have to be equal either, as long as the line of action of the cables is perpendicular to the arms. My Siemens Schuckert has unequal arm lengths but the plastic guides bring the cables in at the right relationship and the tension does not vary.
Yeah, I know but cables eat plastic guides so I never chose to control routing that way. I'm just not a fan of pull pull anyway.
I usually don't go into all the ways to do the deed. Heck, getting people to understand the right angle concept is hard enough.