Caster adjustment

[exquisit]

theres 2 sets of guides perpendicular to each other... how can both adjust the same thing?

http://www.iapdirect.com/images/T/62010.jpg

[stndrd]

my apologies. i was looking at the previous pic on my phone. it is possible that the pictured arm could adjust castor as well but my question is how do you compensate for the adjustment in castor, when it looks to have solid brackets on either side that are connected to the camber adjustment bolts that prevents the ball joint from sliding side to side