Hey this might be a stupid question, but does anyone know why there are always two bolts on the thing that sets angles on metal chop saws and the proper way to set them? Do you guys just loosen one and keep the other still, or do you loosen both and set it at for example 45 degrees and hope its the right angle?

For example, i had to set my angles at 22 1/2 degrees for some welding and i had to cut a piece on my regular wood chop saw and use that as a guide everything and it gets annoying, there has to be some secret to use of the two bolts? Thanks in advance..