QUOTE(fasthonda @ May 15 2011, 06:14 AM)
You need to take the track width into consideration or the strings will not be parallel. The rear track width of the 914 is 1 icnh greater than the front. You need to add 1/2 inch when setting the distance from the front hub vs the rear to achieve parallelism.
I think the confusion here is that the strings are on rods that are indexed. The rods have grooves for the strings to sit in.
You put the strings in the same groove on the front and rear rod. That way, the strings are already parallel to each other. After that, you don't move the strings on the rods, you just move the rod itself, which moves both strings.
With that in mind, the track width difference between the front and rear is completely irrelevant to the rest of the process.
You set the distance to the hub individually per axle. So the front distance might end up to be 6 1/2" left and right and the rear distance might be 5" left and right.
It's only important that the distance is equal per axle!
Maybe this will help, quick and dirty photoshop ...