There was a post on here a while back for a protractor you could use to measure the bent axle angles.
Like this:
I use one, but I find the small markings hard to read. I saw this one at Rockler, on sale right now for $9.99 (reg $34.99). Still needs a notch cut to clear the axle head, but it's about the same money as the plain one and it's easier to read!:

Like this:

I use one, but I find the small markings hard to read. I saw this one at Rockler, on sale right now for $9.99 (reg $34.99). Still needs a notch cut to clear the axle head, but it's about the same money as the plain one and it's easier to read!:
